JP6749905B2 - Communication control method for UE, communication control method for ProSe function unit, UE and ProSe function unit - Google Patents

Description

The present invention relates to a terminal device and the like.

In 3GPP (The 3rd Generation Partnership Project), which carries out standardization activities of mobile communication systems in recent years, the specification of EPS (Evolved Packet System), which realizes all-IP, is being performed. 3GPP is examining an access system connected to EPS, including not only LTE but also a wireless LAN.

Furthermore, 3GPP is examining ProSe (Proximity based Service) described in Non-Patent Document 1 in the specification of EPS. ProSe has a function that a communication terminal UE (User Equipment) detects other nearby communication terminals (discovery) and a function that establishes direct communication between UEs without using a core network or a base station (direct communication). We aim to realize the services we provide.

ProSe enables direct communication between terminals without going through the core network to which the base station or access network is connected, so concentration of access networks and core networks can be avoided (congestion avoidance), and an offload effect is expected. it can.

Further, in ProSe, a UE-to-NW Relay in which a terminal within the communication area serves as a relay terminal of a terminal outside the communication area in order for the terminal outside the communication area of the base station to access the network is also under study.

Specifically, the UE-to-NW Relay is a service realized by directly establishing a communication path between a terminal in the communication area and a terminal outside the communication area of the base station.

A terminal device having a function of connecting to a PDN connection (PDN connection) to a network even from outside the communication area is referred to as a remote UE, and a terminal device providing a PDN connection by a relay to the remote UE is referred to as a relay UE.

ProSe requires a service in which the terminal device searches for and detects a communication target terminal device for direct communication in order to establish a direct communication path between neighboring terminal devices. In other words, the terminal device needs a function of detecting a neighboring terminal device (discovery). In ProSe, as one of the detection methods, the Relay UE transmits an announcement signal notifying that it has a Relay function to the Remote UE, and the Remote UE has examined a detection method by monitoring the announcement signal. There is. Such a detection method is defined as Model A.

Further, as one of detection methods in ProSe, the Remote UE transmits a solicitation signal to the Relay UE, and the Relay UE that receives the request message from the Remote UE sends back a response (Response). A detection method in which a UE detects a Relay UE is also under study. Such a detection method is defined as Model B. The solicitation signal may be an announcement signal, and the Relay UE may receive it by monitoring the announcement signal of the Remote UE.

In ProSe, it is considered to use two methods as a direct communication path between UEs. The first is a method using the LTE access technology. The second is a method using a wireless LAN (WLAN: Wireless LAN) access technology.

Also, in ProSe, non-Public Safety and Public Safety are specified. Non-Public Safety assumes a commercial service by a mobile communication carrier, and can be used only when the UE is located in the LTE base station. On the other hand, in Public Safety, use by disaster prevention radio is assumed, and it can be used not only when the UE is in the LTE base station but also when it is not in the LTE base station (eNB). it can.

3GPP TR23.303 Technical Specification Group Services and System Aspects, Proximity-based Services (ProSe), Stage2 (Release 12)

ProSe is studying means for realizing a function of detecting UEs located in the vicinity (discovery) and a function of establishing direct communication between UEs without going through a core network or a base station (direct communication).

Further, in order to realize the function of the Remote UE to detect the Relay UE located in the vicinity, the Relay UE receives an announcement function of notifying the neighboring UE of its own location, or the Remote UE receives a notification based on the announcement function. A monitoring function for detecting a Relay UE, or a function for the Remote UE to send a request message to the Relay UE and receive a response message, or a function for the Relay UE to receive a request message from the Remote UE and send a response message to the Remote UE. Etc. are being examined.

A UE (Relay UE, Remote UE) uses a Relay Service Code that is a code indicating a connection service that provides a relay of the network for the discovery procedure of Model A by announcement and monitoring, and the discovery procedure of Model B by request and response. And execute.

The Relay Service Code may be associated with the connection service to the PDN provided by the Relay UE and needs to be updated regularly or irregularly from the viewpoint of security.

Therefore, the UE needs to assume that a plurality of Relay Service Codes associated with the same service are notified from the server device.

Therefore, when the UE acquires different Relay Service Codes for the same service and/or sets different Relay Service Codes for the same service, the timing at which the use of the old Relay Service Code is stopped , It is necessary to decide when to start using a new Relay Service Code. However, the specific means of determining these timings has not been clarified at present.

The present invention has been made in view of such circumstances, and an object thereof is to realize a function (discovery) in which a UE existing outside the coverage of a base station detects a UE in the coverage located in the neighborhood. , Relay UE and Remote UE provide a suitable means for controlling the stop or start timing of the ProSe-based relay connection service.

In order to achieve the above object, the terminal device of the present invention is such that the terminal device is directly detected from a nearby terminal device located in the vicinity as a relay terminal device, or directly communicates with the nearby terminal device. , An authorization request message for the first service is sent to a device having the ProSe function, and an authorization message for the authorization request message for the first service is received from the device having the ProSe function. , The procedure started from the terminal device while the first timer is counting, receives the ProSe Restricted Code and the value of the timer corresponding to the ProSe Restricted Code from the device having the ProSe function. A first transmitting/receiving unit that transmits an announcement message including the ProSe Restricted Code to the neighboring terminal device; and a reception time when the first service approval is included in the approval message. And a control unit that starts counting the second timer based on the reception of the ProSe Restricted Code, wherein the ProSe Restricted Code is set by the neighboring terminal device from the terminal device. It is used for detecting the terminal device based on the explicit permission of.

An apparatus having a ProSe function of the present invention receives an approval request message for a first service from a terminal device, transmits an approval message for the approval request message for the first service to the terminal device, and By the procedure started from the terminal device while the timer count is being performed, to the terminal device, to transmit the ProSe Restricted Code and the value of the timer corresponding to the ProSe Restricted Code, having a transceiver unit, The approval request message of the first service requests permission that the terminal device is directly detected as a relay terminal device from a nearby terminal device located in the vicinity or directly communicates with the nearby terminal device. The approval message includes a time during which the approval of the first service is valid, in order to cause the terminal device to start counting the first timer, The ProSe Restricted code is a code included in an announcement message transmitted by the terminal device, in order for the neighboring terminal device to detect the terminal device based on an explicit permission from the terminal device, ..

A communication control method for a terminal device according to the present invention requires permission that the terminal device is directly detected as a relay terminal device from a nearby terminal device located in the vicinity, or directly communicates with the nearby terminal device. In order to do so, a step of transmitting a first service approval request message to a device having a ProSe function, and a step of receiving an approval message for the first service approval request message from the device having a ProSe function, Starting counting of a first timer based on receipt of a time included in the approval message for which the approval of the first service is valid; and while the counting of the first timer is performed. Based on the reception of the ProSe Restricted code, receiving a ProSe Restricted Code and a timer value corresponding to the ProSe Restricted code from the device having the ProSe function by the procedure started from the terminal device. A step of starting counting of a second timer, and a step of transmitting an announcement message including the ProSe Restricted code to the neighboring terminal device, wherein the ProSe Restricted code is used by the neighboring terminal device. It is used for detecting the terminal device based on an explicit permission from the terminal device.

A communication control method of a device having a ProSe function, a step of receiving an approval request message of a first service from a terminal device, and a step of transmitting an approval message for the approval request message of the first service to the terminal device. And transmitting the ProSe Restricted code and the value of the timer corresponding to the ProSe Restricted code to the terminal device by a procedure started from the terminal device while the first timer is counting. , The first service approval request message is that the terminal device is directly detected from a nearby terminal device located in the vicinity as a relay terminal device, or directly communicates with the nearby terminal device. , A message sent to request permission of the first service, and in order to cause the terminal device to start counting the first timer, the approval message includes a time period during which the approval of the first service is valid. Included, the ProSe Restricted code is a code included in an announcement message transmitted by the terminal device, in order to detect the terminal device based on permission of the neighboring terminal device to explicitly detect from the terminal device. , Is characterized.

According to the present invention, it is possible to manage an expiration date under which a relay connection service based on ProSe can be executed under the management of a communication carrier.

It is a figure for explaining the outline of a mobile communication system. It is a figure for demonstrating the structure etc. of an IP mobile communication network. It is a figure for demonstrating the apparatus structure of Relay UE. It is a figure showing an example of each data structure memorized by a storage part. It is a figure for demonstrating the apparatus structure of Remote UE. It is a figure showing an example of each data structure memorized by a storage part. It is a figure for demonstrating the apparatus structure of a ProSe function part. It is a figure showing an example of each data structure memorized by a storage part. It is a figure for demonstrating the apparatus structure of HSS. It is a figure showing an example of each data structure memorized by a storage part. It is a figure for demonstrating the apparatus structure of an application server. It is a figure showing an example of each data structure memorized by a storage part. It is a figure for demonstrating a service authentication procedure. It is a figure for demonstrating an announcement request procedure. It is a figure for demonstrating a monitoring request procedure. It is a figure explaining the update procedure of Relay Service Code. It is a figure for demonstrating the discovery request procedure of Relay UE. It is a figure for demonstrating the discovery request procedure of Remote UE.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. In addition, in the present embodiment, an embodiment of a mobile communication system to which the present invention is applied will be described as an example.

[1. First Embodiment]
Hereinafter, a wireless communication technique according to an embodiment of the present invention will be described in detail with reference to the drawings.

[1.1. Communication system overview]
FIG. 1 is a functional block diagram showing a schematic configuration example of a communication system 1 according to an embodiment of the present invention.

The communication system 1 shown in FIG. 1 is UE_A8 which is a terminal device (ProSe enabled UE) having a function regarding ProSe, PDN (Packet Data Network)_A5, IP mobile communication network_A3, ProSe function part_A7, and ProSe application server. _A2.

Furthermore, the communication system 1 may be configured to include a terminal device having a plurality of functions related to ProSe, such as UE_B9.

PDN_A5 and a terminal device having a function related to ProSe such as UE_A8 or UE_B9 are connected via an IP mobile communication network_A3. Further, UE_A8 and UE_B9 are provided with services based on ProSe.

The ProSe function unit_A7 is a server device for managing the communication of the UE_A8 and/or UE_B9 using the ProSe function, and authenticates the terminal device when providing the ProSe service and the like. The ProSe function unit_A7 may be included in the PDN_A5 or may be independent of the PDN_A5. Alternatively, the ProSe function unit_A7 may be included in the IP mobile communication network_A3.

UE_A8 and UE_B9 may be connected to the same mobile communication carrier network, may be connected to different mobile communication carrier networks, or may be connected to a broadband network operated by a fixed communication carrier.

For example, UE_A8 is connected to an IP mobile communication network operated and managed by a first communication operator (Mobile Operator), and UE_B9 is operated and managed by a second communication operator and operated and managed by a first communication operator. You may connect to the IP mobile communication network different from the IP mobile communication network. The IP mobile communication network by the second carrier in this case may be connected to PDN_A5. Further, the internal configuration thereof may be the same as that of the IP mobile communication network_A3, and thus detailed description thereof will be omitted.

Further, these IP mobile communication networks may be two IP mobile communication networks with which a roaming contract is made or two IP mobile communication networks in the same country.

Further, the ProSe function unit_A7 that manages the communication of the UE_A8 and the UE_B9 may be a ProSe function unit that is managed by the telecommunications carrier contracted by the UE_A8 and the UE_B9, and the ProSe function unit_A7 may It may be managed by a telecommunications carrier within the same country.

The broadband network is an IP communication network operated by a communication carrier, which is connected by ADSL (Asymmetric Digital Subscriber Line) or the like and provides high-speed communication through a digital line such as an optical fiber. Further, the network is not limited to these and may be a network for wireless access such as WiMAX (Worldwide Interoperability for Microwave Access).

Each UE, such as UE_A8 and UE_B9, is a communication terminal that can be connected using an access system such as LTE or WLAN, and is equipped with a 3GPP LTE communication interface or WLAN communication interface, etc. It is possible to connect to the mobile communication network_A3.

However, the present invention is not limited to this, and each UE such as UE_A8 and UE_B9 may be connected using another wireless system such as WiMAX (Worldwide Interoperability for Microwave Access).

Note that in the schematic configuration example shown in FIG. 1, the UE_A8 is placed in a communication area that can connect to the IP mobile communication network_A3, and the UE_B9 is temporarily outside the communication area that cannot connect to the IP mobile communication network_A3. It is arranged. In other words, UE_A8 is within the coverage of the access network and UE_B9 is outside the coverage of the access network.

The UE_A8 uses the relay to provide the network connection service to the UE_B9. In this paper, such a connection service is referred to as a UE-to-NW Relay service.

PDN_A5 is a network that provides a network service for transmitting and receiving data in packets, and is a network that provides a specific communication service such as the Internet or IMS. Note that PDN_A5 may be a PDN (Packet Data Network).

The PDN_A5 is connected to the IP mobile communication network_A3 using a wired line or the like. For example, the connectivity between the PDN_A5 and the IP mobile communication network_A3 is established by ADSL, optical fiber, or the like.

FIG. 2 is a detailed configuration example of the communication system 1 shown in FIG. The configuration example of the system illustrated in FIG. 2A includes a UE_A8, an IP mobile communication network_A3, and a PDN_A5. Besides the UE_A8, a plurality of UEs can be connected to the IP mobile communication network_A3. Further, although FIG. 2 shows an example in which the UE_A8 is connected, the UE_B9 can be configured similarly to the UE_A8 as long as it is within the coverage of the network.

The IP mobile communication network 3 is composed of a core network_A 90 and respective radio access networks (LTE AN_A 80, WLAN ANb 75, WLAN ANa 70, UTRAN_A 20, GERAN_A 25).

The radio access network may be composed of a plurality of different access networks, or may be composed of any one access network. Further, the UE_A8 can be wirelessly connected to the radio access network.

Further, the access network connectable by the WLAN access system is a WLAN access network b (WLAN ANb75) connected to the core network_A90 via the ePDG_A65, and a WLAN access network a (WLAN ANA75) connected to the PGW_A30, PCRF_A60 and AAA_A55. And are configurable.

Since each device is configured similarly to the conventional device in the mobile communication system using EPS, detailed description will be omitted. A brief description of each device will be given below.

The PGW_A30 is connected to the PDN_A5, the SGW_A35, the ePDG_A65, the WLAN ANa70, the PCRF_A60, and the AAA_A55, and is a relay device that transfers user data as a gateway device of the PDN_A5 and the core network_A90. The PGW_A 30 may be a PGW having a function of a conventional PGW (Packet Data Network Gateway).

The SGW_A35 is connected to the PGW_A30, the MME_A40, the LTE AN_A80, the SGSN_A45, and the UTRAN_A20, and relays user data as a gateway device that performs transfer of user data as a gateway device between the core network_A90 and the 3GPP access networks (UTRAN_A20, GERAN_A25, and LTE AN_A80). is there. The SGW_A 35 may be an SGW that further has the function of a conventional SGW (Serving Gateway).

The MME_A 40 is an access control device that is connected to the SGW_A 35, the LTE AN_A 80, and the HSS (Home Subscriber Server)_A 50, and performs position information management of the UE_A 8 and access control via the LTE AN_A 80. Further, the core network_A 90 may be configured to include a plurality of location management devices. For example, a position management device different from the MME_A 40 may be configured. The MME_A 40 may be an MME that further has the function of a conventional MME (Mobility Management Entity). Furthermore, a location management device different from MME_A40 may be connected to SGW_A35, LTE AN_A80, and HSS_A50 like MME_A40.

When the core network_A 90 includes a plurality of MMEs, the MMEs may be connected to each other. Thereby, the context of UE_A8 may be transmitted/received between MMEs.

The HSS_A50 is a management node that is connected to the MME_A40 and the AAA_A55 and manages subscriber information. The subscriber information of HSS_A50 is referred to at the time of access control of MME_A40, for example. Further, the HSS_A 50 may be connected to a location management device different from the MME_A 40. The HSS_A50 may be an HSS that further has the function of a conventional HSS (Home Subscriber Server).

The AAA_A 55 is connected to the PGW_A 30, the HSS_A 50, the PCRF_A 60, and the WLAN ANa 70, and performs access control of the UE connected via the WLAN ANA 70. The AAA_A 55 may be an AAA that further has a conventional AAA (Authentication, Authorization and Accounting) function.

The PCRF_A 60 is connected to the PGW_A 30, the WLAN ANa 75, the AAA_A 55, and the PDN_A 5, and performs QoS management for data delivery. For example, it manages the QoS of the communication path between UE_A8 and PDN_A5.

The ePDG_A 65 is connected to the PGW_A 30 and the WLAN ANb 75, and delivers user data as a gateway device between the core network_A 90 and the WLAN ANb 75. The PCRF_A 60 may be a PCRF having a conventional PCRF (Policy and Charging Rule Function) function.

The SGSN_A45 is connected to the UTRAN_A20, the GERAN_A25, and the SGW_A35, and is a control device for location management between the 3G/2G access network (UTRAN/GERAN) and the LTE access network (E-UTRAN). Further, the SGSN_A 45 has a PGW and SGW selection function, a UE time zone management function, and an MME selection function at the time of handover to the E-UTRAN. The SGSN_A 45 may be an SGSN that further has the function of a conventional SGSN (Serving GPRS Support Node).

Further, as shown in FIG. 2B, each radio access network includes a device to which the UE_A 8 is actually connected (for example, a base station device or an access point device) and the like. The device used for connection may be a device adapted to a wireless access network.

In this embodiment, the LTE AN_A 80 may be an E-URAN including the eNB_A 45. The eNB_A 45 is a radio base station to which the UE_A 8 connects in the LTE access system, and the LTE AN_A 80 may include one or a plurality of radio base stations.

The WLAN ANa 70 includes a WLAN APa 72 and a TWAG_A 74. The WLAN APa 72 is a WLAN access system that is reliable to the operator who operates the core network_A 90, and is a radio base station to which the UE_A 8 connects. The WLAN ANa 70 is configured to include one or more radio base stations. Is also good. The GW 74 is a gateway device for the core network_A 90 and the WLAN ANa 70. Further, the WLAN APa 72 and the GW 74 may be configured by a single device.

Even if the operator who operates the core network_A 90 is different from the operator who operates the WLAN ANA 70, such a configuration can be realized by the contract or agreement between the operators.

Further, the WLAN ANb 75 is configured to include the WLAN APb 76. WLAN APb76 is a radio base station to which UE_A8 connects in the WLAN access system when a trust relationship is not established with the operator operating core network_A90, and WLAN ANb75 includes one or more radio base stations. It may be configured as.

In this way, the WLAN ANb 75 is connected to the core network_A 90 by using the device ePDG_A 65 included in the core network_A 90 as a gateway. The ePDG_A 65 has a security function for ensuring communication safety.

UTRAN_A20 is comprised including RNC(Radio Network Controller)_A24 and eNB(UTRAN)_A22. The eNB(UTRAN)_A22 is a radio base station to which the UE_A8 is connected by UTRA (UMTS Terrestrial Radio Access), and the UTRAN_A20 may include one or a plurality of radio base stations. The RNC_A 24 is a control unit that connects the core network_A 90 and the eNB(UTRAN)_A 22. The UTRAN_A 20 may include one or a plurality of RNCs. Also, the RNC_A 24 may be connected to one or more eNBs (UTRAN). Further, the RNC_A 24 may be connected to a radio base station (BSS (Base Station Subsystem)_A 26) included in the GERAN_A 25.

GERAN_A25 is comprised including BSS_A26. The BSS_A 26 is a radio base station to which the UE_A 8 is connected by GERA (GSM/EDGE Radio Access), and the GERAN_A 25 may be composed of one or a plurality of radio base stations BSS. Also, a plurality of BSSs may be connected to each other. Further, the BSS_A 26 may be connected to the RNC_A 24.

In this specification, connecting a terminal device to each wireless access network means connecting the terminal device to a base station device, an access point, or the like included in each wireless access network. Data and signals to be transmitted and received also pass through the base station device and access point.

[1.2 Device configuration]
The device configurations of the UE_A8 that is the Relay UE, the UE_B9 that is the Remote UE, the ProSe function unit_A7, and the HSS_A and the ProSe application server_A in FIG. 1 will be briefly described with reference to the drawings.

[1.2.1 Configuration of Relay UE]
The device configuration of UE_A8, which is a Relay UE, will be described below. The UE_A8 may be a wireless communication terminal including a ProSe function, may be a mobile phone terminal that transmits and receives data by wireless communication by the LTE access method, or is a device called a machine-to-machine (M2M). It may be a communication terminal that mutually exchanges information.

Further, UE_A8 may be a relay terminal device having a relay function.

FIG. 3 shows a device configuration of UE_A8 in the present embodiment. The UE_A8 includes a transmission/reception antenna_A300, a switch_A304, a direct transmission/reception unit_A308, a transmission/reception unit_A306, a control unit_A302, and a storage unit_A340. The UE_A8 is directly connected to the control unit_A302 by the transmitting/receiving unit_A308, the transmitting/receiving unit_A306, the switch_A304, and the storage unit_A340 via the bus.

The control unit_A 302 is a functional unit for controlling the UE_A8. The control unit_A 302 is a functional unit that reads out and executes various programs stored in the storage unit_A 340.

The switch_A 304 is a functional unit that connects the transmitting/receiving unit_A 306 and the transmitting/receiving unit_A 308 directly to the transmitting/receiving antenna_A 300 under the control of the control unit_A 302.

The transmitting/receiving unit_A 306 is a functional unit that transmits/receives wireless communication data by the LTE access method. The transceiver unit_A 306 includes a transmitter unit and a receiver unit. The transmitter unit can transmit control information via the LTE base station, and the receiver unit can transmit data and control information via the LTE base station. it can.

The direct transmission/reception unit_A 308 is a functional unit that can directly communicate with other UEs using data, control information, or the like without going through the LTE base station. The direct transmitting/receiving unit_A 308 includes a direct transmitting unit and a direct receiving unit. The direct transmitting unit can transmit data and control information without going through the LTE base station, and the direct receiving unit can receive data and control information without going through the LTE base station. The transceiver_A 306 and the direct transceiver_A 308 may be configured as one transceiver.

Note that the transmitting/receiving unit_A 306 and the direct transmitting/receiving unit_A 308 may be respectively assigned with antennas, and data may be transmitted/received under the control of the control unit_A 302.

The storage unit_A 340 is a functional unit that stores programs, data, and the like necessary for each operation of the UE_A8. The storage unit 313 is composed of, for example, a semiconductor memory, an HDD (Hard Disk Drive), or the like.

Further, the storage unit_A 340 stores the UE context_A 342 and the Remote UE context_A 344. The Remote UE Context_A 344 may be part of the UE Context_A 342.

The UE context_A 342 may be context information related to the terminal device, which is conventionally stored in the terminal device. The UE context_A 342 includes at least a UE context for each UE.

FIG. 4A shows a UE context for each UE. As shown in the figure, the UE context for each UE is configured to include at least IMSI, EMM State, GUTI, ME_Identity, and ProSe availability.

The IMSI is identification information assigned to a user (subscriber) who uses the UE_A8. The IMSI may be identification information indicating the contract of the line, or may be stored in the SIM card.

EMM State indicates the mobility management state of UE_A8. For example, the UE_A8 may be EMM-REGISTERED (registered state, registered state) registered in the network, or the UE_A8 may be EMM-DEREGISTERD (unregistered state, deregistered state) not registered in the network.

GUTI is an abbreviation for Globally Unique Temporary Identity and is temporary identification information of UE_A8. The GUTI is composed of identification information (GUMMEI: Globally Unique MME Identifier) of the MME (for example, MME_A40) and identification information (M-TMSI) of the UE_A8 in the specific MME (for example, MME_A40).

ME Identity is an ID of ME, and may be IMEI/IMISV, for example. Further, here, the ME may be a UE.

The ProSe availability is identification information indicating that it has a communication function using ProSe. Further, ProSe availability may be identification information indicating that it has a function of transmitting an announcing signal to a neighboring UE, or identification information indicating a function of becoming a relay terminal between a neighboring terminal and a network. good. Further, there is different identification information for each of these capabilities, and ProSe availability may be identification information combining them.

Furthermore, the UE context_A 342 may store a UE context managed for each PDN connection or a UE context managed for each bearer.

Next, the Remote UE context_A 344 will be described. The Remote UE context_A 344 is a context for managing the connection between the Remote UE and the network because the UE_A 8 is the Relay UE.

The Remote UE context_A 344 includes a Remote UE context for each PDN connection and a Remote UE context for each bearer.

FIG. 4B shows the Remote UE context for each PDN connection. The Remote UE context for each PDN connection includes a PDN connection ID, a PDN connection type, an Application ID, a ProSe Application User ID, an APN, an IP Address Relying, an IP address, a remote access, an IP address, a remote access, a remote access, a remote access UE, a remote access UE, a remote access UE, a remote access UE, a remote access UE, a remote access UE, a remote access UE, a remote access UE, a remote access UE, a remote access UE, a remote access UE, and a remote access UE. Code and Timer are stored.

The PDN connection ID is identification information for identifying the PDN connection. For example, if UE_A8 has established a PDN connection with PDN_A5 for a remote UE, it may store the same PDN connection ID as PDN_A5.

The PDN connection type may be information indicating whether the PDN connection identified by the PDN connection ID is the conventional PDN connection for the own terminal or the PDN connection for the remote UE. Specifically, it may indicate "Normal" when the PDN connection is for the own terminal, and "for Remote UE" when the PDN connection is for the remote UE. Further, the PDN connection type information may be included in the PDN connection ID, and in this case, the PDN connection type may be identified based on the PDN connection ID.

The Application ID is information that identifies an application that can use the PDN connection. The storage unit may store a plurality of Application IDs. Further, when the remote UE of the neighboring terminal is connected to this PDN connection, the application ID for identifying the application used by the neighboring terminal may be stored in the storage unit. In other words, the application ID for identifying the application for the UE_A8 to directly establish the communication path with the neighboring terminal may be stored in the storage unit.

The ProSe Application User ID is identification information for identifying the user assigned by the ProSe application server to perform the relay function using ProSe of the UE_A8. The ProSe Application User ID is information stored in the ProSe application server in association with the user information of the application layer.

APN indicates a connection destination of UE_A8. This APN may be composed of network identification information and default operator identification information.

The IP Address is an IP address assigned to the UE_A8 in the PDN connection, and may be an IPv4 address or an IPv6 prefix.

The IP Address for remote UE is an IP address assigned to a neighboring terminal used for establishing a direct communication path of ProSe between the neighboring terminal and UE_A8. The IP address assigned to the neighboring terminal may be assigned from the IPv6 prefix notified from the network by the UE_A8 or may be notified from the network.

The Default Bearer is EPS bearer identification information for identifying the default bearer in this PDN connection.

Group ID is identification information of a group to which UE_A8 belongs. Further, it may be identification information of a group in which the ProSe function is permitted. When the UE_A8 performs one-to-many communication, the Group ID may be a layer 2 destination address transmitted by the UE_A8.

The Prose Relay UE ID is identification information that identifies the UE_A8. The Prose Relay UE ID may be information indicating approval of the ProSe function unit to function as a relay terminal.

The Relay Service Code is a code indicating a connection service in which the UE_A8 provides a relay for a terminal device and a network in the vicinity.

The Prose Relay UE ID is not transmitted in the direct communication for detecting a neighboring terminal, and is used for the UE_B9 to acquire the Relay Service Code used for detecting the neighboring terminal.

Further, the Relay Service Code is a code used in the neighboring terminal detection procedure of Model A to announce to the neighboring terminals that UE_A8 has a relay function. That is, the UE_A8 includes the Relay Service Code in the announcement signal and transmits the announcement signal, so that the UE_A8 is detected by the neighboring terminal that wants to connect to the network by using the relay function of ProSe. The Relay Service Code may be a code notified from the ProSe function unit.

Alternatively, the Relay Service Code is a code used in the neighboring terminal detection procedure of Model B to announce to the neighboring terminals that the Remote UE has a relay function. That is, the UE_A8 receives the announcement signal including the Relay Service Code from the neighboring Remote UE, and transmits a response to the Remote UE to be detected by the neighboring terminal. The Relay Service Code may be a code notified from the ProSe function unit.

Further, the Relay Service Code may be a connection service of an application for disaster prevention communication (Public Safety), or may be information by which a different code is associated with each application and which can identify the application. .. Timer is a timer associated with the Relay Service Code and indicates the time during which the Relay Service Code is valid.

FIG. 4C shows a Remote UE context for each bearer. At least the transfer path identification information and the Transaction ID may be stored in the Remote UE context for each bearer.

The transfer path identification information may be information identifying the bearer. Specifically, for example, the bearer ID may be used.

The Transaction ID is information for identifying communication using a bearer.

[1.2.2 Configuration of Remote UE]
The device configuration of UE_B9, which is a Remote UE, will be described below. The UE_B9 may be a wireless communication terminal including a ProSe function, may be a mobile phone terminal that transmits and receives data by wireless communication by the LTE access method, or is a device in a form called a machine-to-machine (M2M). It may be a communication terminal that mutually exchanges information. Further, UE_B9 may be a remote terminal device connectable to the relay terminal device.

FIG. 5 shows a device configuration of UE_B9 in the present embodiment. The UE_B9 includes a transmission/reception antenna_B500, a switch_B504, a direct transmission/reception unit_B508, a transmission/reception unit_B508, a control unit_B502, and a storage unit_B540. The UE_B9 is directly connected to the controller_B502 by the transceiver_B508, the transceiver_B506, the switch_B504, and the storage_B540 via the bus.

The control unit_B 502 is a functional unit for controlling the UE_A8. The control unit_B 502 is a functional unit that reads and executes various programs stored in the storage unit_B 540.

The switch_B 504 is a functional unit that connects the transceiver_B 506 and the transceiver_B 508 directly to the transceiver antenna_B 500 under the control of the controller_B 502.

The transmitting/receiving unit_B 506 is a functional unit that transmits/receives wireless communication data by the LTE access method. The transmitter/receiver_B 506 includes a transmitter and a receiver. The transmitter can transmit control information via the LTE base station, and the receiver can transmit data and control information via the LTE base station. it can.

The direct transmission/reception unit_B 508 is a functional unit that can directly communicate with other UEs by using data, control information, or the like without going through the LTE base station. The direct transmission/reception unit_B 508 includes a direct transmission unit and a direct reception unit. The direct transmitting unit can transmit data and control information without going through the LTE base station, and the direct receiving unit can receive data and control information without going through the LTE base station. The transceiver_B 506 and the direct transceiver_B 508 may be configured as one transceiver.

Note that the transmitting/receiving unit_B 506 and the direct transmitting/receiving unit_B 508 may have antennas assigned to them, and may transmit/receive data under the control of the control unit_B 502.

The storage unit_B 540 is a functional unit that stores programs, data, and the like necessary for each operation of the UE_A8. The storage unit 313 is composed of, for example, a semiconductor memory, an HDD (Hard Disk Drive), or the like. Further, the storage unit_B 540 stores the UE context_B 542.

The UE context_B 542 may be configured to include a UE context for each UE, a UE context for each PDN connection, and a UE context for each bearer.

FIG. 6A shows a UE context for each UE. The UE context for each UE may be configured to include IMSI, EMM, State, GUTI, ME Identity, and ProSe availability.

The IMSI is identification information assigned to a user (subscriber) who uses the UE_A8. The IMSI may be identification information indicating the contract of the line, or may be stored in the SIM card.

EMM State indicates the mobility management state of UE_A8. For example, the UE_A8 may be EMM-REGISTERED (registered state, registered state) registered in the network, or the UE_A8 may be EMM-DEREGISTERD (unregistered state, deregistered state) not registered in the network.

GUTI is an abbreviation for Globally Unique Temporary Identity and is temporary identification information of UE_A8. The GUTI is configured by the identification information (GUMMEI: Globally Unique MME Identifier) of the MME (eg, MME_A40) and the identification information (M-TMSI) of the UE_A8 in the specific MME (eg, MME_A40).

ME Identity is an ID of ME, and may be IMEI/IMISV, for example. Further, here, the ME may be a UE.

The ProSe availability is identification information indicating that it has a communication function using ProSe. Further, the ProSe availability may be identification information indicating that the neighboring UE has a function of receiving and detecting an announcing signal transmitted from the neighboring UE, and becomes a Remote UE, and is connected to a network via a direct communication path with a neighboring Relay UE. It may be the identification information indicating the function capable of establishing the PDN connection. Also, there is different identification information for each of these capabilities, and the ProSe availability may be identification information combining them.

FIG.6(b) shows UE context for every PDN connection. In the UE context for each PDN connection, a PDN connection ID, a PDN connection type, an Application ID, a ProSe Application User ID, an APN, an IP Address, a Deficient Deferer, a Remote ID, a Default ID, a Reuse ID, a Promise ID, a Reuse ID, a Promise ID, a Reuse ID, a Promise ID, a Reuse ID, a Promise ID, and a Reuse ID. ..

The PDN connection ID is identification information for identifying the PDN connection. For example, when the UE_B 9 establishes the PDN connection via the ProSe direct communication path with the Relay UE, the same information as the PDN connection ID stored in the PDN_A 5 may be stored. Furthermore, the PDN connection ID stored in UE_B9 may be the same as the information stored in UE_A8.

The PDN connection type may be information indicating whether the PDN connection identified by the PDN connection ID is the conventional PDN connection for the own terminal or the PDN connection via the Relay UE. Specifically, "Normal" may be indicated in the case of the PDN connection for the own terminal, and "by Relay UE" may be indicated in the case of the PDN connection for the Remote UE. Further, the PDN connection type information may be included in the PDN connection ID, and in this case, the PDN connection type may be identified based on the PDN connection ID.

The Application ID may be an Application ID for identifying an application used when the UE_B 9 establishes a direct communication path with a nearby Relay UE.

The ProSe Application User ID is identification information for identifying the user assigned by the ProSe application server to perform the relay function using the ProSe of the UE_B 9. The ProSe Application User ID is information stored in the ProSe application server in association with the user information of the application layer.

APN indicates a connection destination of UE_B9. This APN may be composed of network identification information and default operator identification information.

The IP Address is an IP address assigned to the UE_B9 in the PDN connection, and may be an IPv4 address or an IPv6 prefix.

The Default Bearer is EPS bearer identification information for identifying the default bearer in this PDN connection.

Group ID is identification information of a group to which UE_B9 belongs. Further, it may be identification information of a group in which the ProSe function is permitted. When the UE_B 9 performs one-to-many communication, the Group ID may be a layer 2 destination address transmitted from the Relay UE.

The Prose Remote UE ID is identification information that identifies the UE_B9. The Prose Remote UE ID may be information indicating approval of the ProSe function unit to function as a Remote UE. In other words, the UE to which the ProSe Remote UE ID is assigned may connect to the network by detecting the Relay UE as the Remote UE from the ProSe function unit and directly establishing a communication path with the Relay UE.

In addition, instead of the ProSe Remote UE ID, the ProSe UE ID may be stored in the storage unit.

The ProSe UE ID is identification information that identifies the UE_B9 of the link layer. The Prose UE ID may be information indicating that the terminal device has the ProSe function. In other words, the UE to which the ProSe UE ID is assigned can detect the neighboring terminal using the ProSe function.

The ProSe Remote UE ID and the ProSe UE ID are not transmitted in the direct communication for detecting the neighboring terminal, and are used for the UE_B9 to acquire the Relay Service Code used for detecting the neighboring terminal.

The Relay Service Code is a code indicating a connection service in which the UE_B9 is provided with relay terminals and network relays from the Relay UE.

Further, the Relay Service Code is used in the neighbor terminal detection procedure of Model A, and UE_B9 is used for monitoring the announcement signal transmitted from the nearby Relay UE. That is, the UE_B9 detects the Relay UE by detecting that the announcing signal including the Relay Service Code is received. The Relay Service Code may be a code notified from the ProSe function unit.

Alternatively, the Relay Service Code is a code used when the UE_B9 announces that it is searching for a neighboring terminal having a relay function in the neighboring terminal detection procedure of Model B. That is, the UE_A8 detects an adjacent terminal by transmitting an announcement signal including the Relay Service Code to the nearby Relay UE and receiving the response. The Relay Service Code may be a code notified from the ProSe function unit.

Also, the Relay Service Code may be a connection service of an application for disaster prevention communication (Public Safety), or may be information that can identify an application by associating a different code with each application. ..

Timer is a timer associated with the Relay Service Code and indicates the time during which the Relay Service Code is valid.

FIG. 6C shows a UE context for each bearer. At least the transfer path identification information and the Transaction ID may be stored in the UE context for each bearer.

The transfer path identification information may be information identifying the bearer. Specifically, it may be, for example, the bearer ID of the dedicated bearer.

The Transaction ID is information for identifying communication using a bearer.

[1.2.3 Configuration of ProSe functional unit]
FIG. 7 shows the device configuration of the ProSe function unit_A7 in this embodiment.
The ProSe function unit_A7 is a server device that manages and authenticates services by ProSe such as detection of neighboring terminals and direct communication between terminals, and is a device managed by a mobile communication carrier.

The ProSe function unit_A7 includes a network connection unit_C700, a control unit_C702, and a storage unit_C740. The network connection unit_C 700 and the storage unit_C 740 are connected by a bus via the control unit_C 702.

The control unit_C 702 is a functional unit for controlling the ProSe functional unit_A7. The control unit_C 702 is a functional unit that reads and executes various programs stored in the storage unit_C 740.

The network connection unit_C 700 is a function unit for connecting the ProSe function unit_A 7 to the IP mobile communication network 3. The network connection unit_C 700 may include a transmitting/receiving unit for each functional unit in the IP mobile communication network 3.

The storage unit_C 740 is a functional unit that stores programs, data, and the like necessary for each operation of the ProSe functional unit_A7. The storage unit_C 740 includes, for example, a semiconductor memory, an HDD (Hard Disk Drive), or the like.

Further, the storage unit_C 740 may store the UE context_C 742. Alternatively, the storage unit_C 740 is not limited to the UE context_C 742 as long as various information elements are stored.

The UE context_C 742 may be configured to include a UE context for each UE and a UE context for each Relay Service.

FIG. 8A shows a UE context for each UE. The UE context for each UE is information related to the ProSe function acquired from the HSS.

Specifically, for example, the UE context for each UE may be configured to include IMSI, GUTI, ME Identity, and ProSe availability.

The IMSI is identification information assigned to a user (subscriber) who uses the UE_A8. The IMSI may be identification information indicating the contract of the line, or may be stored in the SIM card.

GUTI is an abbreviation for Globally Unique Temporary Identity and is temporary identification information of the UE. The GUTI is configured by the identification information (GUMMEI: Globally Unique MME Identifier) of the MME (eg, MME_A40) and the identification information (M-TMSI) of the UE_A8 in the specific MME (eg, MME_A40).

ME Identity is an ID of ME, and may be IMEI/IMISV, for example. Further, here, the ME may be a UE.

The ProSe availability is identification information indicating that it has a communication function using ProSe. Further, ProSe availability may be identification information indicating that it has a function of transmitting an announcing signal to a neighboring UE, or identification information indicating a function of receiving an announcing signal transmitted from the neighboring UE, and It may be identification information indicating a function capable of becoming a relay terminal between networks or identification information indicating a function capable of establishing a PDN connection as a remote UE via a neighboring terminal. Further, there is different identification information for each of these capabilities, and ProSe availability may be identification information combining them.

FIG. 8B shows a UE context for each Relay Service. The UE context for each Relay Service may be configured to include an Application ID, a Discovery authorization info, a Group ID, a Relay Service Code, a Timer, and a Relay/Remote UE info.

The Application ID is information that identifies an application that can use the PDN connection. When the remote UE of the neighboring terminal is connected to this PDN connection, the application ID for identifying the application used by the neighboring terminal may be stored in the storage unit. In other words, the application ID for identifying the application for the UE_A8 to directly establish the communication path with the neighboring terminal may be stored in the storage unit. The Application ID may be service identification information that identifies a service.

The Discovery authorization info is information related to the authentication for detecting the neighboring terminal of the UE managed by the ProSe function unit_A7. Specifically, for the UE, the ProSe function unit_A7 authenticates that the ProSe function unit_A7 has authenticated that it detects a neighboring terminal that is a Relay UE, and for the UE, the ProSe function unit_A7 announces to the Remote UE. It may be authentication information indicating that it has been authenticated to be detected by a neighboring terminal by being transmitted.

Group ID is identification information of a group to which the UE belongs. Further, it may be identification information of a group in which the ProSe function is permitted. When the UE performs one-to-many communication, the Group ID may be a layer 2 destination address transmitted by the Relay UE.

The Relay Service Code is identification information that identifies the connectivity provided to the UE by the service. The same Relay Service Code as the Relay Service Code stored by the UE may be stored.

Timer is a timer associated with the Relay Service Code. Timer indicates the time during which the Relay Service Code is valid.

The Relay/Remote UE info is information about the UE that is the direct communication destination of the UE context. That is, when the UE context is the context for the Relay UE, Remote UE info is stored in the storage unit, and when the UE context is the context for the Remote UE, Relay UE info is stored.

Further, these pieces of information may be the ProSe Remote UE ID, the ProSe Relay UE ID, or the ProSe UE ID of each terminal device.

[1.2.4 HSS configuration]
FIG. 9 shows the device configuration of the HSS_A 50 in this embodiment. The HSS_A50 is a server device that manages subscriber information. Further, the HSS_A 50 manages permission information and the like for service provision of communication services such as ProSe.

The HSS_A50 includes a network connection unit_D900, a control unit_D902, and a storage unit_D940. The network connection unit_D900 and the storage unit_D940 are connected by a bus via the control unit_D902.

The control unit_D 902 is a functional unit for controlling the HSS_A 50. The control unit_D 902 is a functional unit that reads out and executes various programs stored in the storage unit_D 940.

The network connection unit_D 900 is a functional unit for the HSS_A 50 to connect to the IP mobile communication network 3. The network connection unit_D 900 may include a transmission/reception unit for each functional unit in the IP mobile communication network 3.

The storage unit_D 940 is a functional unit that stores programs, data, and the like necessary for various operations of the HSS_A 50. The storage unit 707 is composed of, for example, a semiconductor memory, an HDD (Hard Disk Drive), or the like.

Further, the storage unit_D 940 may store the HSS data_D 942. The storage unit_D 940 may be managed as subscriber information for each UE.

The HSS data_D 942 includes HSS data for each UE and HSS data for each PDN connection.

FIG. 10A shows HSS data for each UE. As shown in the figure, HSS data for each UE may include IMSI, MSISDN, IMEI/IMEISV, Access Restriction, ProSe capability, and PLMN list.

The IMSI is identification information assigned to a user (subscriber) who uses the UE_A8. The IMSI may be identification information indicating the contract of the line, or may be stored in the SIM card. MSISDN represents the telephone number of the UE. IMEI/IMEISV is identification information assigned to the UE. Access Restriction indicates registration information of access restriction.

ProSe capability indicates whether the UE has the ProSe function. Here, the ProSe function means the ability to detect a neighboring terminal and the ability to directly communicate with the neighboring terminal. That is, when the HSS data of each UE includes ProSe capability, the UE can detect the neighboring terminal or be detected by the neighboring terminal by ProSe, and can directly communicate with the neighboring terminal. Furthermore, the ProSe capability may be information indicating that it is permitted to provide the network connection service to the neighboring terminal by directly communicating with the neighboring terminal. Alternatively, the ProSe capability may be information indicating that the network connection service is permitted to be provided by directly communicating with the neighboring terminal. Alternatively, both pieces of information may be included.

PLMN list is a list of PLMNs to which the UE is allowed to detect neighboring terminals. Moreover, the HSS_A 50 may store the authentication information including the PLMN list. The HSS_A 50 may notify the ProSe functional unit of the PLMN ID permitted by the UE based on the request of the ProSe functional unit.

Although each element of the HSS data for each UE has been described so far, the HSS data for each UE is not limited to this, and other information may be stored.

FIG.10(b) shows data by HSS for every PDN connection. The HSS data for each PDN connection includes a Context ID, a PDN address, a PDN Type, a PDN connection Type, an APN, and a PDN GW ID.

The Context ID is information that identifies a context that includes HSS data for each PDN.

PDN Address indicates the IP address with which the UE was registered when the PDN connection was established.

PDN Type indicates the type of PDN Address. That is, for example, it is identification information for identifying IPv4 or IPv6 or IPv4v6.

The PDN connection type is information indicating whether the PDN connection identified by the PDN connection ID is the conventional PDN connection for its own terminal, the PDN connection for the remote UE, or the PDN connection provided by the relay UE. Good to have Specifically, if it is a PDN connection for its own terminal, "Normal", if it is a PDN connection for a remote UE, "for Remote UE", if it is provided to a relay UE, "by Relay UE", etc. You may show it. Further, the PDN connection type information may be included in the PDN connection ID, and in this case, the PDN connection type may be identified based on the PDN connection ID.

APN indicates a connection destination of UE_A8. This APN may be composed of network identification information and default operator identification information.

PDN GW identity is identification information for identifying the PGW used in this APN. This identification information may be FQDN (Fully Qualified Domain Name) or IP address.

Although each element of the HSS data for each PDN connection has been described so far, the HSS data for each PDN connection is not limited to this, and other information may be stored.

[1.2.5 Configuration of ProSe Application Server]
FIG. 11 shows the device configuration of the ProSe application server_A2 in this embodiment. The ProSe application server_A2 is an application server related to ProSe, and may be a server device that associates and manages application layer user information with permission information such as permission info, and stores permission information for each user. ..

The ProSe application server_A2 includes a network connection unit_E1100, a control unit_E1102, and a storage unit_E1140. The network connection unit_E 1100 and the storage unit_E 1140 are connected by a bus via the control unit_E 1102.

The control unit_E 1102 is a functional unit for controlling the ProSe application server_A2. The control unit_E 1102 is a functional unit that reads out and executes various programs stored in the storage unit_E 1140.

The network connection unit_E 1100 is a functional unit for connecting the ProSe application server_A 2 to the IP mobile communication network 3. The network connection unit_E 1100 may include a transmission/reception unit for each functional unit in the IP mobile communication network 3.

The storage unit_E 1140 is a functional unit that stores programs, data, and the like necessary for each operation of the ProSe application server_A2. The storage unit_E 1140 includes, for example, a semiconductor memory, an HDD (Hard Disk Drive), and the like.

Further, the UE context_E 1142 may be stored in the storage unit_E 1140. Alternatively, the storage unit_E 1140 is not limited to the UE context_E 1142 and may store various information elements.

The UE context_E 1142 includes at least the UE context for each user.

FIG. 12A shows a UE context for each user. The UE context_E 1142 for each user is configured by including the Application Layer User ID, the ProSe Function ID, the Application ID, the ProSe Application User ID, and the Permit info.

The Application Layer User ID is user identification information at the application layer.

The ProSe Function ID is identification information that identifies the ProSe function unit with which the user has been authenticated. The ProSe Function ID may be an FQDN (Fully Qualified Domain Name) or an IP address.

The Application ID is information that identifies an application that provides the ProSe service to the user.

The ProSe Application User ID (PAUID) is information that identifies a user, and is information that is stored in association with the Application Layer User ID. It may be the same as the ProSe Application User ID stored in the ProSe function unit.

The permission info is information indicating permission information of the ProSe function for each user. Specifically, the permission info may be managed using a management table as shown in FIG. 12B, for example.

In the example illustrated in FIG. 12B, the permission information managed by the permission info may be managed by the Remote UE function and the ProSe Relay UE function.

Here, the Remote UE function indicates a function that can detect a neighboring terminal that becomes a Relay UE as a Remote UE and can use the PDN connection provided to the Relay UE.

In the example of FIG. 12B, the user assigned the PAUID (A) is not permitted to use the Remote UE function, but is permitted to be the ProSe Relay UE function. Further, the user assigned with PAUID(B) is permitted the Remote UE function, but not the ProSe Relay UE function.

Further, the ProSe Relay UE function is a Relay UE, which is a function capable of providing a network connection service to a neighboring terminal.

Furthermore, the permission info may include a Discovery Type to which the user is permitted.

Specifically, information indicating that the Discovery procedure is a method of detecting a Relay UE by receiving a signal announced by the Remote UE from the Relay UE may be included in the permission info.

Alternatively, information indicating that the Discovery procedure is a detection method for detecting the Relay UE by receiving the Response transmitted from the Relay UE based on the Solicitation information transmitted from the Remote UE is information indicating the detection of the transmission information. May be included in. Further, these may be stored in association with each function (Remote UE function, ProSe Relay UE function).

[1.3 Description of processing]
The outline of the processing described in this embodiment will be described below.

[1.3.1 Service authentication procedure]
The UE_A8 and the UE_B9 carry out an authentication procedure for detecting a neighboring terminal (ProSe Direct Discovery) provided as a ProSe service and for communication (ProSe Direct Communication) using a direct communication path.

Further, UE_A8 performs an authentication procedure for using the ProSe Relay UE function as a ProSe service, and UE_B9 performs an authentication procedure for using the Remote UE function.

The neighboring terminal detection and the communication using the direct communication path may be authenticated by different procedures, or may be authenticated by a single authentication procedure.

Further, the authentication of the ProSe Relay UE function or the authentication of the Remote UE function may be performed together with the neighboring terminal detection and the authentication procedure for the communication using the direct communication path, or may be performed by a different procedure.

Here, in the following service authentication procedure, UE_A8 and UE_B9 are located within the coverage (communication range) of the base station.

[1.3.1.1 Service Authentication Procedure of Relay UE]
Hereinafter, the Relay UE authentication procedure in this embodiment will be described with reference to FIG.

First, the UE_A8 serving as the Relay UE executes the attach procedure and connects to the core network (S1302). As a result of the attach procedure, the UE_A8 establishes a PDN connection with the PGW_A30. The PDN connection is a communication path for transmitting/receiving data to/from the PDN 5. The attach procedure may be performed as an initial procedure, such as when the UE_A8 is powered on.

More specifically, description will be given using an attach procedure. UE_A8 initiates by sending an attach request to MME_A40. The attach request may be transmitted by including the identification information of the UE such as APN and IMSI. Further, the APN is not necessarily included in the attach request message and may be notified from the UE_A8 to the MME_A40 by a control message in the attach procedure.

Further, the UE_A8 may request the conventional PDN connection or may request the PDN connection used for the UE-to-NW Relay. The UE_A8 may include, in the attach request message, identification information indicating whether to request a conventional PDN connection or a PDN connection used for UE-to-NW Relay.

The MME_A 40 selects the PGW_A 30 based on the received APN and determines the endpoint of the PDN connection for the UE_A8. Further, the PDN connection establishment and the connection to the core network are permitted, and an attach permission message which is a response to the attach request message is transmitted to UE_A8. The attach permission message may be directly transmitted from the MME_A 40 to the UE_A 8 or may be transmitted via the eNB_A 45 included in the LTE AN_A 80.

When the MME_A 40 authenticates that the UE_A 8 is a Relay UE in the security authentication procedure with the HSS_A 50, the MME_A 40 permits the establishment of the PDN connection for the UE-to-NW Relay and responds to the attach request message and The permission information may be included in the attached attach permission message and transmitted.

Alternatively, based on the APN included in the attach request transmitted by the UE_A8, the MME_A 40 permits the establishment of the PDN connection for the UE-to-NW Relay, and the permission information is included in the attach permission message that is a response to the attach request message. May be included in the transmission.

In addition, the MME_A 40 may notify that the UE_A 8 is permitted to connect to the core network by transmitting an attach permission message. Further, the MME_A 40 may notify that the PDN connection is established by transmitting the attach permission message. Furthermore, the attach permission message may be transmitted including the IP address associated with the PDN connection and the APN.

Further, the MME_A 40 may include the ProSe UE ID in the attach permission message and transmit the message. Here, the ProSe UE ID is identification information of the terminal assigned to the UE having the ProSe function. For example, the MME_A 40 may include the ProSe UE ID in the attach permission message based on the fact that the APN transmitted by the UE_A 8 in the attach procedure is the APN associated with the ProSe service and may be transmitted. At this time, the MME_A 40 may allocate the ProSe UE ID to the UE_A8. Alternatively, it may be acquired from HSS_A50. In this case, the HSS_A 50 or the like may store the ProSe UE ID in the subscriber information in advance.

Further, the ProSe UE ID may be a ProSe Relay UE ID. That is, the MME_A 40 may include the ProSe Relay UE ID in the attach permission message based on the fact that the identification information of the UE_A 8 is associated with the Relay UE function.

Next, the UE_A8 transmits a ProSe registration request to the ProSe function unit_A7 (S1304). The ProSe registration request may be a ProSe registration request message that requests the ProSe function unit_A7 to register as a UE having the ProSe function. The UE_A8 may request detection of a neighboring terminal, permission of communication using a direct communication path, and use of the Relay UE function by transmitting a ProSe registration request message. In addition, the UE_A8 transmits information including, in the ProSe registration request message, information for identifying the neighboring terminal detection, the communication using the direct communication path, and the permission to use the Relay UE function, and requests the permission. Is also good.

The UE_A8 may also send the ProSe registration request message by using the PDN connection established by the attach procedure. Further, the ProSe registration request message may be transmitted by using the IP address acquired in the attach procedure as the source address.

Further, the ProSe function unit_A7 that is the destination of the ProSe registration request message may hold in advance the information of the ProSe function unit_A7 associated with the home PLMN that is the telecommunications carrier with which the contract is made, and may use it as the destination. ..

Alternatively, it may be used as a transmission destination by holding a list of communication carriers capable of providing the ProSe service as a local PLMN and further holding a ProSe function unit_A7 associated with the local PLMN. ..

The local PLMN may be any telecommunications carrier determined by the contract relationship with the Home PLMN or the like, or may be a telecommunications carrier operating in the same country as the Home PLMN.

As described above, the UE_A8 may hold the PLMN ID for identifying the PLMN and the ProSe function unit_A7 in association with each other, and use them as the transmission destination to request authentication.

Further, the PLMN ID and the information of the ProSe function unit_A7 may be acquired from Home PLMN. For example, an inquiry may be made to the ProSe function unit_A7 of Home PLMN, and the inquiry may be acquired and held in response to the inquiry.

The ProSe function unit_A7 may receive the ProSe registration request and perform authentication of detection of a neighboring terminal, communication using a direct communication path, and relay communication using the Relay UE function (S1306). The ProSe function unit_A7 may assign the ProSe Relay UE ID to the UE_A8 based on the authentication.

Further, the ProSe function unit_A 7 may request the registration information of the UE regarding ProSe from the HSS_A 50 when the UE context is not stored in the ProSe function unit.

When the ProSe function unit_A7 cannot authenticate the relay communication using the Rlelay UE function with respect to the UE_A8, the ProSe function unit_A7 does not have to assign the ProSe Relay UE ID to the UE_A8.

Further, the ProSe function unit_A7 may send an authentication request to the ProSe application server_A2 as necessary. Specifically, the ProSe function unit_A7 may request the ProSe application server_A2 to authenticate the UE_A8 based on the operator policy or the network policy. The ProSe function unit_A7 may include the ProSe Relay UE ID in the authentication request message and may transmit the authentication request message to the ProSe application server_A2.

Based on the reception of the authentication request message or the reception of the ProSe Relay UE ID, the ProSe application server_A2 communicates with the UE_A8 by detecting a neighboring terminal and using a direct communication path, and relay communication using the Relay UE function. You can certify.

The ProSe function unit_A7 may transmit the ProSe registration response based on the authentication (S1308). The ProSe registration response may be a response message to the ProSe registration request received from the UE_A8.

The ProSe registration response may be transmitted including the authentication result. The ProSe function unit_A7 may store information for authenticating in association with the UE_A8, and may determine whether to allow or disallow the authentication result based on the information.

Further, the ProSe function unit_A7 may include the ProSe Relay UE ID in the ProSe registration response and transmit it to the UE_A8 based on the reception of the ProSe registration request. The ProSe Relay UE ID may be an ID associated with the UE_A8, and the UE_A8 may use the ProSe Relay UE ID as information for identifying the terminal when detecting the neighboring terminal or notifying itself to the neighboring terminal. good. More specifically, the UE_A8 may include the ProSe Relay UE ID in the announcement signal for transmission.

The ProSe function unit_A7 may notify the authentication failure by not including the ProSe Relay UE ID in the response message.

The UE_A8 receives the ProSe registration response and acquires the authentication result. Moreover, you may acquire and hold ProSe Relay UE ID contained in a ProSe registration response.

Further, the UE_A8 may also receive from the ProSe function unit_A7 a timer that is associated with the service and indicates the time during which the service authentication is valid. UE_A8 may start counting based on the reception of the timer. Furthermore, if the counting is completed, the service authentication request may be sent again to the ProSe function unit_A7. Alternatively, the service authentication request may be transmitted while the timer is counting, based on the request from the network.

[1.3.1.2 Service Authentication Procedure of Remote UE]
Next, the service authentication procedure of the Remote UE in this embodiment will be described with reference to FIG.

First, the UE_B9 serving as the Remote UE executes the attach procedure and connects to the core network (S1302). As a result of the attach procedure, the UE_B9 establishes a PDN connection with the PGW_A30. The PDN connection is a communication path for transmitting/receiving data to/from the PDN 5. The attach procedure may be performed as an initial procedure, such as when the UE_B9 is powered on.

More specifically, description will be given using an attach procedure. UE_B9 starts by sending an attach request to MME_A40. The attach request may be transmitted by including the identification information of the UE such as APN and IMSI. Also, the APN does not necessarily have to be included in the attach request message, and may be notified from the UE_B9 to the MME_A40 by a control message in the attach procedure.

The MME_A 40 selects the PGW_A 30 based on the received APN and determines the endpoint of the PDN connection for the UE_B 9. Further, the PDN connection establishment and the connection to the core network are permitted, and an attach permission message which is a response to the attach request message is transmitted to UE_A8. The attach permission message may be directly transmitted from the MME_A 40 to the UE_A 8 or may be transmitted via the eNB_A 45 included in the LTE AN_A 80.

Further, the MME_A 40 may notify that the UE_B 9 is permitted to connect to the core network by transmitting an attach permission message. Further, the MME_A 40 may notify that the PDN connection is established by transmitting the attach permission message. Furthermore, the attach permission message may be transmitted including the IP address associated with the PDN connection and the APN.

Further, the MME_A 40 may include the ProSe UE ID in the attach permission message and transmit the message. Here, the ProSe UE ID is identification information of the terminal assigned to the UE having the ProSe function. For example, the MME_A 40 may include the ProSe UE ID in the attach permission message based on the fact that the APN transmitted by the UE_A 8 in the attach procedure is the APN associated with the ProSe service and may be transmitted. At this time, the MME_A 40 may assign the ProSe UE ID to the UE_B9. Alternatively, it may be acquired from HSS_A50. In this case, the HSS_A 50 or the like may store the ProSe UE ID in the subscriber information in advance.

Also, the ProSe UE ID may be a ProSe Remote UE ID. That is, the MME_A 40 may include the ProSe Remote UE ID in the attach permission message based on the fact that the identification information of the UE_B 9 is associated with the Remote UE function.

Next, the UE_B9 sends a ProSe registration request to the ProSe function unit_A7 (S1304). The ProSe registration request may be a ProSe registration request message that requests the ProSe function unit_A7 to register as a UE having the ProSe function. The UE_B9 may request the permission of the neighbor terminal detection, the communication using the direct communication path, and the access to the network using the relay service by the Remote UE function by transmitting the ProSe registration request message. In addition, the UE_B9 transmits information including the proximity terminal detection, the communication permission using the direct communication path, and the information identifying the access to the network using the relay service by the Remote UE function in the ProSe registration request message, You may ask for permission individually.

Further, the ProSe registration request may be transmitted using the PDN connection established in the attach procedure. Further, the ProSe registration request message may be transmitted by using the IP address acquired in the attach procedure as the source address.

Further, the ProSe function unit_A7 that is the destination of the ProSe registration request message may hold in advance the information of the ProSe function unit_A7 associated with the home PLMN that is the telecommunications carrier with which the contract is made, and may use it as the destination. ..

Alternatively, it may be used as a transmission destination by holding a list of communication carriers capable of providing the ProSe service as a local PLMN and further holding a ProSe function unit_A7 associated with the local PLMN. ..

The local PLMN may be any telecommunications carrier determined by the contract relationship with the Home PLMN or the like, or may be a telecommunications carrier operating in the same country as the Home PLMN.

As described above, the UE_B 9 may hold the PLMN ID for identifying the PLMN and the ProSe function unit_A 7 in association with each other, and use them as a transmission destination to request authentication.

Further, the PLMN ID and the information of the ProSe function unit_A7 may be acquired from Home PLMN. For example, an inquiry may be made to the ProSe function unit_A7 of Home PLMN, and the inquiry may be acquired and held in response to the inquiry.

The ProSe function unit_A7 may receive the ProSe registration request and perform authentication of detection of a neighboring terminal, communication using a direct communication path, and relay communication using the Remote UE function (S1306). The ProSe function unit_A7 may assign the ProSe Remote UE ID to the UE_A8 based on the authentication.

Further, the ProSe function unit_A 7 may request the registration information of the UE regarding ProSe from the HSS_A 50 when the UE context is not stored in the ProSe function unit.

When the ProSe function unit_A7 cannot authenticate the relay communication using the Remote UE function with respect to the UE_B9, the ProSe function unit_A7 does not have to assign the ProSe Remote UE ID to the UE_B9.

Further, the ProSe function unit_A7 may send an authentication request to the ProSe application server_A2 as necessary. The ProSe function unit_A7 may send the authentication request message including the ProSe Application User ID.

The ProSe application server_A2 receives the authentication request message or receives the ProSe Application User ID to detect the neighboring terminal to the user and perform communication using the direct communication path, and relay communication using the Remote UE function. You can certify.

The ProSe function unit_A7 may transmit the ProSe registration response based on the successful authentication (S1308).

The ProSe registration response may be transmitted including the authentication result. The ProSe function unit_A7 may hold information for authenticating in association with the UE_B9, and may decide whether to allow or disallow the authentication result based on the information.

Further, the ProSe function unit_A7 may include the ProSe Remote UE ID in the ProSe registration response and transmit it to the UE_B9 based on the reception of the ProSe registration request. The ProSe Remote UE ID may be an ID associated with the UE_B9, and the UE_B9 may be used as information for identifying a terminal when detecting the neighboring terminal or notifying itself to the neighboring terminal. More specifically, the UE_B 9 may include the ProSe Remote UE ID in the request for establishing a ProSe direct communication path with the UE_A 8 and transmit the request.

Alternatively, the ProSe function unit_A7 may include the ProSe UE ID in the ProSe registration response and transmit it to the UE_B9. The ProSe UE ID is identification information that identifies the UE_B9. The Prose UE ID may be information indicating that the terminal device has the ProSe function. In other words, the UE to which the ProSe UE ID is assigned can detect the neighboring terminal using the ProSe function.

UE_B9 receives the ProSe registration response and acquires the authentication result. Further, the ProSe Remote UE ID or ProSe UE ID included in the ProSe registration response may be acquired and held.

Also, the UE_B9 may receive from the ProSe function unit_A7 together with a timer that is associated with the service and indicates the time during which the authentication of the service is valid. UE_B9 may start counting based on the reception of the timer. Furthermore, if the counting is completed, the service authentication request may be sent again to the ProSe function unit_A7. Alternatively, the service authentication request may be transmitted while the timer is counting, based on the request from the network.

[1.3.2 Discovery Request Procedure]
Next, an authentication procedure for each UE (Relay UE and Remote UE) to start a discovery procedure by announcement or monitoring will be described.

Each UE may start the following procedure on condition that the service is authenticated by the attach procedure.

[1.3.2.1 Announcement request procedure]
First, a procedure in which the UE_A8 requests an announcement will be described. Announcement means that the terminal notifies the terminals located in the vicinity of its own existence.

In the following, a procedure in which UE_A8 executes an announcement will be described with reference to FIG.

UE_A8 sets the permission information of the ProSe application server_A2 and the Relay UE function (S1402).

In setting the permission information of the Relay UE function, the UE_A8 notifies the ProSe application server including the ProSe Relay UE ID assigned by the ProSe function unit.

The ProSe application server_A8 assigns the ProSe Application User ID to the user ID in the application layer based on the reception of the ProSe Relay UE ID.

In addition, the ProSe Application Server_A2 may assign the ProSe Application User ID to the UE_A8 as a Restricted ProSe Application User ID for the restricted discovery.

It should be noted that the restricted discovery means a procedure for detecting a neighboring terminal under the explicit permission from the detected UE.

The ProSe application server_A2 notifies the ProSe Application User ID assigned to the UE_A8.

The permission information may be set before or after the service authentication procedure.

Next, UE_A8 transmits a discovery request to ProSe function part_A7 (S1404). The discovery request may be a discovery request message requesting that UE_A8 start an announcement procedure. Here, the transmission of the discovery request by the UE_A8 may be performed on the condition that the service authentication procedure is completed. More specifically, the ProSe function unit_A7 of Home PLMN, which is the telecommunications carrier with which the contract is made, may be subject to the condition that the UE_A8 is authenticated to announce. Further, the UE_A8 may acquire the authentication information from the ProSe function unit_A7 upon completion of the authentication and may hold the authentication information.

The discovery request may include a ProSe Application User ID, a UE ID, a command indicating an announcement, a discovery type indicating discovery for the UE-to-NW Relay service, and an Application ID.

Here, the ProSe Application User ID is information notified from the ProSe application server_A2 in the permission setting procedure.

The UE ID is identification information of the UE_A8 and may be, for example, IMSI. Alternatively, it may be ME Identity.

Further, the information indicating that the announcement is requested is not limited to the method of identifying with the command, and may be requested by defining the announcement request message and transmitting the announcement request message. More specifically, a message type requesting an announcement may be defined and a request message including the message type may be transmitted.

Further, the discovery type may be information indicating that the requested discovery procedure is for the UE-to-NW Relay service, and is a discovery by announcement and monitoring (Model A).

The command and/or discovery type may be capability information indicating that the UE_A 8 has a relay function between a terminal device in the vicinity and a network. Alternatively, separately from these pieces of information, UE_A8 may indicate that the UE_A8 has a relay function between a terminal device in the vicinity and a network.

Note that the UE_A8 may include a combination of a plurality of discovery types and Application IDs in the discovery request and transmit the discovery request.

Specifically, UE_A8 transmits a discovery request including a combination of Application ID A and a discovery type=“UE-to-NW Relay” and a combination of Application ID B and a “recovered discovery”. good.

Also, the ProSe function unit_A7 that is the destination of the discovery request holds in advance information regarding the ProSe function unit_A7 of Home PLMN, which is the telecommunications carrier with which the UE_A8 has a contract, and uses the ProSe function unit_A7 of Home PLMN as the destination. Is also good.

Also, the UE_A8 may include the APN in the discovery request. APN indicates a network to which UE_A8 requests access.

The ProSe function unit_A7 confirms whether the UE_A8 is permitted to perform the UE-to-NW Relay announcing function based on the Application ID or the UE ID.

Furthermore, the ProSe function unit_A7 confirms whether or not the Relay Service Code and the timer have already been assigned to the UE_A8.

The ProSe function unit_A7 may send a discovery request to the application server_A2 based on the network policy or the operator policy.

In this case, the ProSe function unit_A7 may send the discovery request including the ProSe Application User ID and the discovery type.

The ProSe application server_A2 confirms the permission information by the permission info of the user identified by the ProSe Application User ID or the like based on the reception of the discovery request from the ProSe function unit_A7.

The ProSe application server_A2 may send a discovery response as a response to the discovery request to the ProSe function unit_A7 when the permission information is confirmed. The discovery response may be a discovery request response message. The discovery response may include the ProSe Application User ID permitted to use the service. Further, the discovery response may include identification information indicating that the use of the service is permitted.

The ProSe function unit_A7 allocates the Relay Service Code and the timer to the UE_A8 based on the discovery response from the ProSe application server_A2 or the permission of the service by the ProSe function unit_A7.

The Relay Service Code is identification information associated with the UE-to-NW Relay service. Further, the Relay Service Code may be temporary identification information assigned to the service by the ProSe function unit_A7.

The timer is associated with the Relay Service Code, and is a timer indicating the time during which the Relay Service Code is valid. That is, the announcement using the Relay Service Code is permitted until the count of the timer ends.

When the discovery type included in the discovery request is only “UE-to-NW Relay”, the ProSe function unit_A7 is associated with the same Application ID based on the operator policy or the network policy, and the ProSe Restricted Code. (ProSe Restricted Code A) may be further allocated to UE_A8. Furthermore, the ProSe function unit_A7 may correspond to the ProSe Restricted Code and may also allocate a timer indicating the time during which the ProSe Restricted Code is valid.

The ProSe Restricted Code is a code used by the ProSe functional unit for the ProSe restricted Discovery service, and may be associated with one or a plurality of ProSe Application User IDs.

The ProSe Restricted Discovery service is a service detected by a terminal device that is detected from the detected terminal device under explicit permission. For example, a UE having a monitoring function obtains a ProSe Restricted Code from a UE having an announcement function in the vicinity, confirms permission of explicit detection, and receives an announcement including the ProSe Restricted Code. Is a service for detecting the UE.

Therefore, ProSe Restricted Code A is a code assigned to the ProSe Application User ID of the user of UE_A8.

Note that even if the timer value associated with the ProSe Restricted Code and indicating the time during which the ProSe Restricted Code is valid is different from the timer value associated with the Real Service Code indicating the time during which the Relay Service Code is valid, Good or the same value.

When the discovery request includes a combination of Application ID A and discovery type=“UE-to-NW Relay” and a combination of Application ID B and “restricted discovery”, the ProSe function unit_A7 Further, ProSe Restricted Code (ProSe Restricted Code B) may be assigned to the UE_A8. Furthermore, the ProSe function unit_A7 may correspond to the ProSe Restricted Code and may also allocate a timer indicating the time during which the ProSe Restricted Code is valid.

Here, ProSe Restricted Code B is a code assigned to the ProSe Application User ID of the user of UE_A8.

The ProSe function unit_A7 assigns the ProSe Restricted Code (ProSe Restricted Code B) to the UE_A8 in response to the discovery request from the UE_A8, and the ProSe Restricted Code (ProSe RestrictedAde) assigned to the UE_A8 regardless of the discovery request from the UE_A8. May be different or different.

Further, the timer associated with ProSe Restricted Code B and the timer associated with ProSe Restricted Code A may be the same or different.

The ProSe function unit_A7 transmits a discovery response to the UE_A8 based on the service permission and the setting of the Relay Service Code (S1410).

The discovery response may include a timer associated with the Relay Service Code and the code.

Furthermore, when the ProSe function unit_A7 assigns the ProSe Restricted Code to the UE_A8, the ProSe function unit_A7 may include a timer corresponding to the ProSe Restricted Code and the ProSe Restricted Code in the discovery response.

That is, the ProSe function unit_A7 sends the UE_A8 by including the timer "T1" associated with the Relay Service Codes "C1" and "C1" in the discovery response. Further, the ProSe function unit_A7 has a ProSe Restricted Code “Cr1” associated with the same Application ID as the Application ID associated with the Real Service Code “C1” and a timer “Tr1” associated with “Cr1”. And may be included in the discovery response and transmitted.

In addition, the ProSe function unit_A7 further includes a ProSe Restricted Code “Cr2” associated with an Application ID different from the Application ID associated with the Real Service Code “C1”, and a timer “Cr2” associated with the ProSe Restricted Code. "Tr2" may be included in the discovery response and transmitted.

Further, the timers “T1”, “Tr1”, and “Tr2” may have the same value or different values.

Next, UE_A8 receives the discovery response. Further, the value of the ProSe Relay Service Code and the timer may be acquired.

Further, the UE_A8 may acquire a timer corresponding to the ProSe Restricted Code and the ProSe Restricted Code when the discovery response is received.

Further, the UE_A8 determines whether the announcement is permitted based on the information included in the discovery response.

When the announcement is permitted, wireless resources may be allocated (S1412), and a signal including the acquired ProSe Relay Service Code may be transmitted to the neighborhood. The wireless resource information such as frequency and time may be acquired from the ProSe function unit_A7, or resources for announcement may be held and allocated in advance.

Further, the UE_A8 may start counting the timer based on the reception of the discovery response. Also, the UE_A8 may transmit a signal for announcement until the timer expires (Expire). Further, when the timer has expired (when the timer expires) such as when the value of the timer becomes zero, the announcement is stopped. Note that the announcement signal may include the ProSe Relay Service Code and be transmitted. Furthermore, the signal for the announcement may be transmitted by including the UE ID and/or the ProSe Relay UE ID. Also, the signal for the announcement may include information for identifying the communication capability such as the communication capacity of the PDN connection provided by the UE_A 8 to the Remote UE.

If the discovery response indicates that authentication is not possible, the UE_A8 does not allocate radio resources or make an announcement.

Through the above procedure, the UE_A8 can perform the authentication procedure for executing the announcement.

[1.3.2.2 Monitoring request procedure]
Next, a procedure for the UE_B9 to request monitoring will be described. Monitoring means that a terminal notifies its presence to terminals located in the vicinity.

When the UE_B9 has connectivity to the base station, the UE_B9 may perform the following monitoring request procedure in advance and be authenticated by the server device for monitoring.

Hereinafter, a procedure for the UE_B9 to perform monitoring will be described with reference to FIG.

The UE_B9 sets permission information for the ProSe application server_A2 and the Remote UE function (S1502).

In setting the permission information of the Remote UE function, the UE_B9 may notify the ProSe application server_A2 by including the ProSe Remote UE ID or ProSE UE ID assigned by the ProSe function unit_A7.

The ProSe application server_A2 may assign the ProSe Application User ID to the user ID of the application layer based on the reception of the ProSe Remote UE ID or the ProSe UE ID.

In addition, the ProSe Application Server_A2 may assign the ProSe Application User ID to the UE_A8 as a Restricted ProSe Application User ID for the restricted discovery.

The ProSe application server_A2 notifies the ProSe Application User ID assigned to the UE_B9.

Further, the UE_B9 may acquire the ProSe Application User ID of the UE that can be monitored in the permission setting procedure. Specifically, the ProSe Application User ID of the UE_A8 may be acquired.

The permission information may be set before or after the service authentication procedure.

Next, the UE_B9 transmits a discovery request to the ProSe function unit_A7 (S1504). The discovery request may be a discovery request message that requests UE_B9 to initiate a monitoring procedure. Here, the transmission of the discovery request by the UE_B 9 may be performed on the condition that the service authentication procedure is completed. More specifically, the ProSe function unit_A7 of Home PLMN, which is the telecommunications carrier with which the contract is made, may be subject to the condition that the UE_B9 is authenticated to announce. Further, the UE_B9 may acquire the authentication information from the ProSe function unit_A7 upon completion of the authentication and may hold the authentication information.

The discovery request may include a ProSe Application User ID, a UE ID, a command indicating monitoring, a discovery type indicating discovery for the UE-to-NW Relay service, and an Application ID.

Here, the ProSe Application User ID is information notified from the ProSe application server_A2 in the permission setting procedure.

The UE ID is identification information of the UE_B9 and may be, for example, IMSI. Alternatively, it may be ME Identity.

Further, the information indicating that monitoring is requested is not limited to the method of identifying with a command, and may be requested by sending a monitoring request message by defining a monitoring request message. More specifically, a message type requesting monitoring may be defined and a request message including the message type may be transmitted.

Further, the discovery type may be information indicating that the requested discovery procedure is for the UE-to-NW Relay service, and is a discovery by announcement and monitoring (Model A).

The command and/or the discovery type may be capability information indicating that the UE_B 9 has a relay function between a terminal device in the vicinity and a network. Alternatively, separately from these pieces of information, the UE_B 9 may indicate that the UE_B 9 has a relay function between a terminal device and a network in the vicinity.

Note that the UE_B 9 may send a discovery request including a combination of a plurality of discovery types and Application IDs.

Specifically, UE_B9 transmits a discovery request including a combination of Application ID A and discovery type=“UE-to-NW Relay” and a combination of Application ID B and “recovered discovery”. good.

Also, the ProSe function unit_A7 that is the destination of the discovery request holds in advance information regarding the ProSe function unit_A7 of Home PLMN, which is the telecommunications carrier with which the UE_B9 makes a contract, and uses the ProSe function unit_A7 of Home PLMN as the destination. Is also good.

Also, the UE_B 9 may include the APN in the discovery request. APN indicates a network to which UE_A8 requests access.

Further, the UE_B 9 may include the ProSe Application User ID of the UE requesting the monitoring in the discovery request. For example, UE_B9 may indicate that it wants to detect UE_A8 by including the ProSe Application User ID of UE_A8 in the discovery request. The UE_B 9 may include a plurality of ProSe Application User IDs in the discovery request.

The ProSe function unit_A7 confirms whether the UE_B9 is permitted to monitor the UE-to-NW Relay based on the Application ID or the UE ID.

Further, the ProSe function unit_A7 confirms whether or not the Relay Service Code and the timer have already been assigned to the UE_B9.

The ProSe function unit_A7 may send a discovery request to the application server_A2 based on the network policy or the operator policy.

In this case, the ProSe function unit_A7 may send the discovery request including the ProSe Application User ID of the UE_B9 and the discovery type.

If the received discovery request message includes the ProSe Application User ID of the UE to be monitored, the ProSe function unit_A7 sends the discovery request including the ProSe Application User ID of the UE to be monitored by the ProSe application server_A2. You may do it.

The ProSe application server_A2 confirms the permission information of the user identified by the ProSe Application User ID based on the discovery request received from the ProSe function unit_A7.

The ProSe application server_A2 may send a discovery response as a response to the discovery request to the ProSe function unit_A7 when the permission information is confirmed. The discovery response may include the ProSe Application User ID permitted to use the service. Further, the discovery response may include identification information indicating that the use of the service is permitted.

Furthermore, if the ProSe application server_A2 has acquired the list of ProSe Application User IDs of the UEs that the UE_B9 wants to monitor, the ProSe application server_A2 may include the ProSe Relay UE IDs corresponding to the ProSe Application User IDs in the discovery response and transmit the discovery response.

The ProSe function unit_A7 allocates the Relay Service Code and the timer to the UE_B9 based on the discovery response from the ProSe application server_A2 or the permission of the service by the ProSe function unit_A7.

The Relay Service Code is identification information associated with the UE-to-NW Relay service. Further, the Relay Service Code may be temporary identification information assigned to the service by the ProSe function unit_A7. Further, the Relay Service Code may be the same as the value assigned to the UE_A8.

The ProSe function unit_A7 may allocate the Relay Service Code from the ProSe Relay UE ID notified from the ProSe application server_A2. Specifically, when the ProSe application server_A2 notifies the ProSe Relay UE ID of the UE_A8, the Relay Service Code assigned to the UE_A8 in the storage unit may be assigned to the UE_B9.

The timer is associated with the Relay Service Code, and is a timer indicating the time during which the Relay Service Code is valid. That is, the announcement using the Relay Service Code is permitted until the count of the timer ends.

Further, the ProSe function unit_A7 may allocate a combination of a plurality of Relay Service Codes and timers to the UE_B9.

In addition, when the discovery type included in the discovery request is only “UE-to-NW Relay”, the ProSe function unit_A7 is associated with the same Application ID based on the operator policy or the network policy, and the ProSe Restricted Code. (ProSe Restricted Code A) may be further allocated to UE_B9. Furthermore, the ProSe function unit_A7 may correspond to the ProSe Restricted Code, and may allocate a timer indicating the time during which the ProSe Restricted Code is valid.

Note that this is different from the value of the timer associated with the ProSe Restricted Code and indicating the time during which the ProSe Restricted Code is valid, and the value of the timer associated with the Real Service Code indicating the time during which the Relay Service Code is valid. May be the same or may be the same value. Also, the timer indicating the time during which the ProSe Restricted Code is valid, which is associated with the ProSe Restricted Code, may be the timer during which the Relay Service Code, which is associated with the Real Service Code, is valid. That is, the timer may be a timer associated with the ProSe Restricted Code and the Real Service Code.

When the discovery request includes a combination of Application ID A and discovery type=“UE-to-NW Relay” and a combination of Application ID B and “restricted discovery”, the ProSe function unit_A7 Further, ProSe Restricted Code (ProSe Restricted Code B) may be assigned to UE_B9. Furthermore, the ProSe function unit_A7 may correspond to the ProSe Restricted Code, and may allocate a timer indicating the time during which the ProSe Restricted Code is valid.

The ProSe function unit_A7 assigns the ProSe Restricted Code (ProSe Restricted Code B) to the UE_B9 in response to the discovery request from the UE_B9, and the ProSe Restricted Code (ProSe Restored Restricted) that is assigned to the UE_B9 regardless of the discovery request from the UE_B9. May be different or different.

Furthermore, the value of the timer associated with ProSe Restricted Code B and the value of the timer associated with ProSe Restricted Code A may be the same or different.

Further, when the ProSe function unit_A7 assigns the same ProSe Restricted Code to the UE_B9, the timer may be the same.

The ProSe function unit_A7 transmits a discovery response to the UE_B9 based on the service permission and the setting of the Relay Service Code (S1510). The discovery response may be a response message to the discovery request.

The discovery response may include a discovery filter.

The discovery filter may include a Relay Service Code and a timer indicating the time during which the Relay Service Code associated with the Relay Service Code is valid.

Furthermore, when the ProSe function unit_A7 assigns the ProSe Restricted Code to the UE_B9, the ProSe function unit_A7 may add a combination of a timer corresponding to the ProSe Restricted Code and the ProSe Restricted Code to the discovery response and the discovery filter.

That is, the ProSe function unit_A7 includes the timer "T1" associated with the Relay Service Codes "C1" and "C1" in the discovery filter and transmitted to the UE_B9.

Further, the ProSe function unit_A7 has a ProSe Restricted Code “Cr1” associated with the same Application ID as the Application ID associated with the Real Service Code “C1” and a timer “Tr1” associated with “Cr1”. And may be included in the discovery filter and transmitted. Cr1 may be C1 and Tr1 may be T1. In this case, the ProSe function unit_A7 may send the discovery filter including "C1" and "T1".

In addition, the ProSe function unit_A7 further includes a ProSe Restricted Code “Cr2” associated with an Application ID different from the Application ID associated with the Real Service Code “C1”, and a timer “Cr2” associated with the ProSe Restricted Code. "Tr2" may be included in the discovery filter and transmitted.

Further, the timers “T1”, “Tr1”, and “Tr2” may have the same value or different values. When these timers have the same value, the ProSe function unit_A7 may include "T1" in the discovery filter.

The combination of these codes and the timer may be included in different discovery filters, or may be included in one discovery filter.

That is, the ProSe function unit_A7 may send a discovery response including a plurality of discovery filters.

Next, UE_B9 receives the discovery response. Further, the value of the ProSe Relay Service Code and the timer may be acquired.

Further, the UE_A8 may acquire the timers corresponding to the ProSe Restricted Code and the ProSe Restricted Code when the discovery response is received.

In addition, the UE_A8 determines whether monitoring is permitted based on the information included in the discovery response.

When the monitoring is permitted, radio resources are allocated (S1512), and the obtained discovery filter is used to monitor the announcement signal transmitted by the neighboring terminal device. The wireless resource information such as frequency and time may be acquired from the ProSe function unit_A7, or resources to be monitored may be held and allocated in advance.

Also, the UE_B 9 may start counting the timer based on the reception of the discovery response. Also, UE_A8 may monitor until the timer expires (Expire). Further, when the timer has expired (when the timer is Expire), such as when the value of the timer becomes zero, monitoring is stopped. The signal to be monitored may include the Relay Service Code. Further, the monitored signal may include the UE ID and/or the ProSe Relay UE ID. In addition, the signal for monitoring may include information for identifying the communication capability such as the communication capacity of the PDN connection provided to the Remote UE by the nearby Relay UE.

When the discovery response indicates that the authentication is not possible, the UE_B 9 does not allocate radio resources or make an announcement.

Through the above procedure, the UE_B 9 can perform the authentication procedure for performing monitoring.

In addition, when UE_B9 is out of the coverage, the monitoring request procedure may be performed by other procedures.

For example, the UE_B9 out of the coverage and the UE_A8 in the coverage previously hold an arbitrary code for the monitoring service, and based on the arbitrary code, the UE_A8 sets the service authentication and/or the permission setting of the UE_B9 and/or Monitoring authentication based on the discovery request may be executed.

Hereinafter, a specific example in which the UE_B 9 out of coverage transmits the monitoring request will be described. The UE_B9 outside the coverage has the Monitoring Service Code for monitoring in advance as described above, and the UE_B9 broadcasts a discovery request including the Monitoring Service Code.

The UE_B 9 may include a ProSe Application User ID, a UE ID, a command indicating monitoring, a discovery type indicating discovery for a UE-to-NW Relay service, or an Application ID in the discovery request. ..

Further, the discovery type may be information indicating that the requested discovery procedure is for the UE-to-NW Relay service, and is a discovery by announcement and monitoring (Model A).

Further, the discovery request may include identification information indicating that the discovery request transfer is requested. Alternatively, by including the Monitoring Service Code, the UE_B 9 may request the transfer of the discovery request.

The UE_A8 that receives the discovery request transmitted by the UE_B9 may transfer the discovery request received from the UE_B9 to the ProSe functional unit_A7 based on the Monitoring Service Code included in the discovery request. The UE_A8 may perform service authentication to the ProSe function unit_A7 and permission setting to the ProSe application before transferring the discovery request.

The ProSe function unit_A7 confirms whether the UE_B9 is permitted to perform the UE-to-NW Relay monitoring function based on the discovery request received from the UE_A8 or based on the Application ID or the acquisition of the UE ID.

Further, the ProSe function unit_A7 confirms whether or not the Relay Service Code and the timer have already been assigned to the UE_B9.

The ProSe function unit_A7 may send a discovery request to the application server_A2 based on the network policy or the operator policy.

Since the discovery request procedure for the application server_A is the same as the above, the description is omitted.

The ProSe function unit_A7 further allocates the Relay Service Code and the timer to the UE_B9 based on the authentication of the monitoring procedure of the UE_B9. Further, as in the case where the UE_B9 is in the coverage, the ProSe function unit_A7 may allocate the ProSe Restricted Code and the timer to the UE_B9.

The method of assigning each code and timer is the same as when UE_B9 is in the coverage, and thus detailed description thereof will be omitted.

The ProSe function unit_A7 transmits a discovery response to the UE_B9 via the UE_A8 based on the authentication of the monitoring procedure for the UE_B9 and the allocation of the Relay Service Code.

The ProSe function unit_A7 may send the discovery response including the discovery filter.

The discovery filter may include a Relay Service Code and a timer indicating the time during which the Relay Service Code associated with the Relay Service Code is valid.

As described above, the UE_B 9 may acquire the Relay Service Code used for monitoring and the timer by transmitting the discovery request even outside the coverage.

[1.3.2.3 Procedure for establishing direct communication path and establishing relay connection]
Hereinafter, after the announcement request and the monitoring request of 1.3.2.1 and 1.3.2.2 are completed, the Remote UE detects the Relay UE, establishes the direct communication path of ProSe, and further uses the relay. Explain the procedure to connect to the existing network.

When UE_B9 is out of the coverage area, UE_B9 detects nearby Relay UEs by using monitoring. Therefore, the UE_B9 stores one or a plurality of Relay Service Codes in advance before performing the detection procedure (Discovery procedure) by the monitoring request procedure of 1.3.2.2, and the announcing signal transmitted by the neighboring terminal. To monitor.

UE_B9 monitors the announcement signal including the Relay Service Code transmitted by UE_A8. Further, the UE_A8 may include the ProSe Relay UE ID, information about the user of the UE_A8, and the state of the physical layer in the announcement signal.

Here, the state of the physical layer may be a transmission rate or a communication capacity that the UE_A8 can provide to the Remote UE by a relay service.

Further, the UE_A8 may include the location information of the UE_A8 in the announcement signal and transmit the announcement signal.

When the Relay Service Code stored in the UE_B9 is the same as the Relay Service Code transmitted from the UE_A8, the UE_B9 can detect the UE_A8.

At this time, UE_B9 may detect a plurality of Relay UEs. When the UE_B 9 detects a plurality of Relay UEs, the UE_B 9 may select the Relay UE from the remaining time of the timer corresponding to the Relay Service Code, the capability of the Relay UE, and the position information of the Relay UE.

If UE_B9 selects UE_A8 as the Relay UE, or if it receives an announce signal from UE_A8 only, UE_B9 establishes direct communication with UE_A8.

Specifically, UE_B9 transmits a direct communication establishment request message to UE_A8. The UE_B9 may include the ProSe Relay UE ID of the UE_A8 in the request for establishment of direct communication and transmit the request.

Upon receiving the request message from UE_B9, UE_A8 authenticates UE_B9 and establishes a direct communication connection.

When the direct communication path with the UE_A8 can be established, the UE_B9 requests the UE_A8 to allocate the IP address. When the UE_B9 requests IPv6, the UE_B9 transmits an RS signal (Router Solicitation message) to the UE_A8. Upon receiving the RS signal, the UE_A8 may set the IP address assigned to the UE_B9 from the IPv6 prefix in the UE_B9.

UE_A8 transmits an RA signal (Router Advertisement message) to UE_B9. The RA signal includes the assigned IP address.

Alternatively, when UE_B9 requests IPv4 allocation, UE_B9 sends DHCPv4 discover to UE_A8 to UE_A8. The UE_A8 selects and allocates from the IP addresses pooled in the UE_B9 based on the reception of the detection message. Further, UE_A8 sends a DHCPv4 offer message to UE_B9. UE_A8 includes the IP address assigned to UE_B9 in the DHCPv4 offer.

UE_B9, which has received the DHCP offer from UE_A8, transmits a DHCPSCP request including the received IP address.

The UE_A8, which has received the DHCP request from the UE_B9, returns a DHCP Ack as a response.

As described above, the IPv6 or IPv4 IP address is assigned to the UE_B9, and the UE_B9 is provided with the connection to the PDN connection.

[1.3.3 Relay Service Code Update Procedure]
Next, the procedure for updating the Relay Service Code will be described. The Relay Service Code needs to be updated regularly from the viewpoint of security.

[1.3.3.1 Relay Service Code Update Procedure of Relay UE]
Hereinafter, the procedure for updating the Relay Service Code stored in the UE_A8, which is the Relay UE, will be described.

The UE_A8 can update the Relay Service Code based on the notification from the ProSe function unit_A7 and continue the announcement.

In the following description, for the connection service using the UE-to-NW Relay function, the UE_A8 that acquires the Relay Service Code and the timer and starts counting the timer is an application identified by the same Application ID. A new ProSe Relay Service Code and timer are acquired for the same connection service, such as the connection service for the, and the old Relay Service Code and timer are disabled, and the new ProSe Relay Service Code and timer are used.

The initial state of this procedure may be a state in which the announcement request procedure described in 1.3.2.1 is completed.

That is, the UE_A8 may be in a state of acquiring "C1" as the Relay Service Code and "T1" as the timer from the ProSe function unit_A7 by the announcement request procedure described in 1.3.2.1.

Details will be described below with reference to FIG. First, the UE_A8 starts counting the timer "T1" based on the announcement request procedure or the reception of the discovery response, and validates the Relay Service Code "C1" (S1606). After transmitting the discovery response, the ProSe function unit_A7 starts counting the timer "T1'" corresponding to the timer "T1" and validates the Relay Service Code "C1" (S1607).

As described in the announcement procedure in 1.3.2.1, the UE_A8 may transmit an announcement signal to perform the announcement while the timer “T1” is counting.

The UE_A8 may request the ProSe function unit_A7 for the Relay Service Code and the timer for the same relay connection service while the timer “T1” is counting. In other words, the UE_A8 may newly request the Relay Service Code and the timer from the ProSe function unit_A7 before the timer "T1" expires (Expire).

The re-request by the UE_A8 may be executed due to the remaining time of the timer becoming short. More specifically, the UE_A 8 may retain the threshold value in advance and make a request again when the remaining time of the timer becomes equal to the threshold value or when the remaining time is less than the threshold value. The re-request trigger is not limited to these, and may be performed under other conditions, or may be performed at any timing.

The UE_A8 may send a discovery request to the ProSe function unit_A7 in order to request the Relay Service Code and the timer for the same relay connection service again (S1608).

Here, the discovery request may be a discovery request message requesting an announcement. The discovery request message for announcement may be the discovery request message (S1404) transmitted by the UE_A8 described in the announcement request procedure in 1.3.2. The process regarding the transmission of the UE_A8, the configuration of the discovery request message, the information elements included in the discovery request message, and the like may be the same, and thus detailed description thereof will be omitted here.

Note that the UE_A8 may indicate the request message for the same service by including the same APN as the APN included in the previous discovery request in the discovery request.

Next, the ProSe function unit_A7 receives the discovery request. Furthermore, a discovery response is transmitted to UE_A8 as a response message (S1610). The response message may be transmitted by including the Relay Service Code and a timer.

Further, this discovery response may be a discovery response message requesting the announcement described in 1.3.2.1 (S1410).

Here, the condition for transmitting the discovery response may be transmitted based on the reception of the discovery request or may be transmitted based on the authentication. Here, a specific method of authentication may be executed by the method described in the announcement request procedure in 1.3.2.

Alternatively, the ProSe function unit_A7 may update the ProSe Relay Service Code based on the connection state of the network or the operator policy without receiving the discovery request from the UE_A8 again. The Relay Service Code updated by the ProSe function unit_A7 may be included in the notification message and notified to the UE_A8.

Similar to the discovery response, the notification message includes a timer value that is associated with the updated Relay Service Code and indicates the time during which the Relay Service Code is valid.

In addition, the Relay Service Code and the timer included in the discovery response or the notification message include the old Relay Service Code “C1” that has already been allocated and the remaining time of the timer “T1” corresponding to the old Relay Service Code “C1”. May be.

Alternatively, the Relay Service Code and the timer included in the discovery response or notification message are different from the Relay Service Code "C1" in the new Relay Service Code "C2", and the timer "T2" corresponding to the new Relay Service Code "C2". May be included.

Here, the old Relay Service Code "C1" and the new Relay Service Code "C2" may be associated with a single Application ID.

Whether to transmit the old Relay Service Code or the new Relay Service Code may be determined based on the following conditions and processing.

Since the remaining time of the timer T1 is short, the ProSe function unit_A7 may include a new Relay Service Code “C2” and a new timer “T2” for transmission. More specifically, the ProSe function unit_A7 holds a threshold value in advance, and when the remaining time of the timer becomes equal to the threshold value or when the remaining time is less than the threshold value, a new Relay Service Code "C2" and a timer You may transmit including "T2."

If the timer T1 has a sufficient remaining time, the ProSe function unit_A7 may transmit the old Relay Service Code "C1" and the timer "T1" including the remaining time. More specifically, the ProSe function unit_A7 holds a threshold value in advance, and when the remaining time of the timer is greater than or equal to the threshold value, a new Relay Service Code "C1" and a timer "T1" are set. The time may be transmitted including the remaining time.

Alternatively, the ProSe function unit_A7 may determine based on the received discovery request. For example, the UE_A 8 may transmit the discovery request including the identification information.

This identification information may be identification information indicating whether the old Relay Service Code is requested or a new Relay Service Code is requested.

The ProSe function unit_A7 may include a new Relay Service Code "C2" and a timer "T2" based on the identification information and transmit the new Relay Service Code "C2". Further, based on the identification information, the old Relay Service Code “C1” and the remaining time of the timer “T1” may be included in the transmission.

Also, the ProSe function unit_A7 may be determined based on the presence or absence of the identification information. That is, the identification information may be identification information indicating a request for a new Relay Service Code. For example, the UE_A8 may send the discovery request without including the identification information and request the old Relay Service Code. Further, the UE_A8 may send a discovery request including the identification information and request a new Relay Service Code.

In addition, based on the fact that the identification information is not included in the discovery request, the old Relay Service Code “C1” and the remaining time of the timer “T1” may be included in the transmission. In addition, the ProSe function unit_A7 may include a new Relay Service Code "C2" and a timer "T2" for transmission based on the identification information included in the discovery request.

Alternatively, the identification information may be identification information indicating a request for an old Relay Service Code. For example, the UE_A8 may send a discovery request without including the identification information and request a new Relay Service Code. Moreover, UE_A8 may transmit a discovery request including identification information and may request the old Relay Service Code.

The ProSe function unit_A7 may include a new Relay Service Code "C2" and a timer "T2" for transmission based on the fact that the identification information is not included in the discovery request. In addition, based on the fact that the discovery request includes the identification information, the old Relay Service Code “C1” and the remaining time of the timer “T1” may be included in the transmission.

Such identification information may be an information element such as a flag included in the discovery request, or an information element indicating the message type of the control message.

In this way, the ProSe function unit_A7 may transmit the time including the remaining time of the timer "T1" to synchronize the timers of a plurality of UEs.

Further, this discovery request may be a discovery request for requesting the announcement described in 1.3.2. Therefore, these pieces of identification information may be included in the discovery request requesting the announcement described in 1.3.2.

In addition, whether to transmit the old Relay Service Code or the new Relay Service Code may be determined based on the setting of the ProSe function unit_A7 and the like. For example, the setting of the ProSe function unit_A7 may be determined and set according to the policy (Mobile Operator Policy) of the carrier operating the ProSe function unit_A7 or the policy of the application carrier.

It should be noted that the determination may be made by combining the conditions and processing described above, or may be made based on another method.

Next, UE_A8 receives the discovery response. Furthermore, the UE_A8 acquires the Relay Service Code and the timer included in the discovery response.

When the UE_A8 acquires the new Relay Service Code "C2", the UE_A8 may stop using the old "C1" and start using the new Relay Service Code "C2" (S1612).

Specifically, for example, the UE_A8 may invalidate the old Relay Service Code “C1” and validate the new Relay Service Code “C2”.

The UE_A8 may stop counting the timer "T1" corresponding to the old Relay Service Code "C1" and start counting the timer "T2" corresponding to the new Relay Service Code "C2".

Further, the old Relay Service Code “C1” and the timer “T1” may be deleted from the storage unit.

Further, the UE_A8 may stop the transmission of the announcement signal using the old Relay Service Code "C1", and thereafter make settings such as not performing the announcement using the Relay Service Code "C1".

In addition, the ProSe function unit_A7 may stop counting “T1′” and start counting “T2′” corresponding to the timer “T2” along with the transmission of the discovery response (S1614).

The UE_A8 may transmit an announcement signal using the new Relay Service Code “C2” until the timer “T2” corresponding to the new Relay Service Code “C2” expires (Expire).

Further, whether or not the UE_A8 executes the update procedure of the Relay Service Code may be determined based on the setting of the UE_A8 and the like. For example, the setting of the UE_A8 may be determined and set by a user policy, a policy (Mobile Operator Policy) of a communication carrier who operates the ProSe function unit_A7, or a policy of an application carrier.

It should be noted that the determination may be made by combining the conditions and processing described above, or may be made based on another method.

Further, when the UE_A8 does not perform the update procedure of the Relay Service Code, the UE_A8 may continue the announcement using the old Relay Service Code. For example, when the UE_A8 receives the old Relay Service Code “C1” by receiving the response message, the UE_A8 uses the old Relay Service Code “C1” until the counting timer “T1” expires (Expire). You may continue the announcement. Note that the UE_A8 may update the value of the timer received from the remaining time of the timer “T1” and continue counting.

Alternatively, when the UE_A8 does not perform the update procedure of the Relay Service Code, the UE_A8 may stop all announcements using the old Relay Service Code and the new Relay Service Code.

Through the above procedure, the UE_A8 can continue the announcement corresponding to the connection service by the relay.

If the UE_A8 is assigned an old Relay Service Code “C1” and a timer “T1” and ProSe Restricted Code “Cr1” and a timer “Tr1” are assigned to the same Application ID, the update of the Real Service Code is performed. The ProSe Restricted Code and the timer may be updated during the procedure.

Alternatively, only the Relay Service Code and the timer may be updated.

[1.3.3.2 Relay Service Code Update Procedure for Remote UE]
Next, the procedure for updating the Relay Service Code of the Remote UE will be described. As shown in FIG. 1, when the Remote UE has already acquired the Relay Service Code, the Remote UE may be out of the coverage.

With the update of the Relay Service Code of the Relay UE, it is necessary to update the Real Service Code of the Remote UE as well.

Specifically, for example, when the UE_A8 is providing the PDN connection service using the relay by the direct communication of ProSe to the neighboring terminal, the UE_A8 updates the Relay Service Code and the timer by using the direct communication of the ProSe. Based on this, the neighboring terminal may be notified of the update of the Relay Service Code.

Specifically, when the UE_A8 is providing the PDN connection by the relay to the UE_B9 and acquires a new Real Service Code and a timer, the UE_A8 updates the Relay Service Code and the timer, and notifies the UE_B9 of the update of the Relay Service Code. The notification message may be notified using ProSe direct communication.

The UE_A8 may include, in the notification message, identification information for identifying the notification message of the update of the Relay Service Code.

Alternatively, the UE_A8 may implicitly stop providing the PDN connection to the UE_B9 upon receiving the new Relay Service Code.

UE_B9 receives the notification message from UE_A8. The UE_B9 transmits a discovery request message for updating the Real Service Code and/or the timer upon receiving the notification message from the UE_A8 or upon implicitly stopping the PDN connection service.

The discovery request message transmitted from the UE_B9 is the same as the discovery request message described in 1.3.2.2, and thus detailed description will be omitted.

Similar to the explanation in 1.3.2.2, when the UE_B9 is out of the coverage, the UE_A8 which is the Relay UE may transfer the discovery request to the ProSe function unit_A7.

The ProSe function unit_A7 may allocate a new Relay Service Code and a timer to the UE_B9 based on the reception of the discovery request.

Further, the ProSe function unit_A7 may send the discovery response to the UE_B9 via the UE_A8.

The discovery response message may include a discovery filter. The discovery filter included in the discovery response message may include a new Relay Service Code and a new timer.

The UE_B 9 may stop the timer corresponding to the old Relay Service Code and update the Relay Service Code and the timer with acquisition of a new discovery filter or a new Relay Service Code and a new timer.

As described above, the procedure for updating the Real Service Code of the Remote UE may be executed. In other words, the Remote UE may re-request a new Real Service Code to the ProSe functional unit in response to the notification from the Relay UE and the suspension of service provision, thereby acquiring and updating the new Relay Service Code and timer.

[1.3.4 Modification of Relay Service Code Update Procedure]
In 1.3.3, the example of the procedure in which the UE_A8 updates the Relay Service Code has been described, but the specific procedure is not limited to this embodiment, and the design and the range not departing from the gist of the present invention. Combinations and the like are also included in the present invention.

Moreover, in the update procedure of the Relay Service Code of 1.3.3, although the UE_A8 receives the discovery response, the example in which the announcement using the old ProSe Relay Service Code is stopped has been described, but the monitoring may be continued.

Specifically, the identification information indicating the request for the update procedure of the Relay Service Code included in the discovery response by the ProSe function unit_A7 may be the identification information requesting that the monitoring using the old Relay Service Code be continued. At this time, in addition to the processing described in 1.3.3, the UE_A8 uses the identification information included in the discovery response until the timer "T1" corresponding to the old Relay Service Code "C1" expires (Expire). Monitoring using the old Relay Service Code "C1" may be continued.

The procedure for acquiring and updating the Relay Service Code for the Remote UE to detect the Relay UE using the detection of the Model A has been described above.

Further, a procedure has been described in which the Remote UE establishes a direct connection with the Relay UE based on the detection and establishes a PDN connection.

[2. Second Embodiment]
In the first embodiment, the Relay UE transmits an announcement signal, and the Remote UE performs monitoring, thereby acquiring and updating a Relay Service Code for the Remote UE to detect a neighboring Relay UE (Model A). As described above, in the present embodiment, the Relay UE monitors the announcement signal transmitted by the Remote UE and sends back a response message, so that the Remote UE detects the neighboring Relay UE (Model B), and the Relay Service Code. The acquisition and update method will be described.

Hereinafter, a wireless communication technique according to an embodiment of the present invention will be described in detail with reference to the drawings.

[2.1. Outline of communication system and device configuration]
The outline of the communication system and the configuration of each device may be the same as the outline and the device configuration of the communication system described in 1.1 and 1.2, and thus detailed description will be omitted.

[2.2 Description of processing]
The outline of the processing described in this embodiment will be described below.

[2.2.1 Service authentication procedure]
The UE_A8 and the UE_B9 carry out an authentication procedure for detecting a neighboring terminal (ProSe Direct Discovery) provided as a ProSe service and for communication (ProSe Direct Communication) using a direct communication path.

Further, UE_A8 performs an authentication procedure for using the ProSe Relay UE function as a ProSe service, and UE_B9 performs an authentication procedure for using the Remote UE function.

The neighboring terminal detection and the communication using the direct communication path may be authenticated by different procedures, or may be authenticated by a single authentication procedure.

The service authentication procedure may be the same as that in the first embodiment, and detailed description thereof will be omitted.

[2.2.2 Discovery Request Procedure]
Next, an authentication procedure for each UE (Relay UE and Remote UE) to start a discovery procedure by a request (Solicitation) and a response (Response) will be described.

Each UE may start the following procedure on condition that the service is authenticated by the attach procedure.

Alternatively, the Remote UE may start the discovery request procedure even if the service authentication is not performed when it is out of the coverage.

[2.2.2.1 Discovery Request Procedure of Relay UE]
First, a procedure in which the UE_A8 monitors a request received from the UE_B9 and requests that a response message to the request can be transmitted will be described.

Hereinafter, a discovery request procedure for the UE_A8 to monitor and send a response message will be described with reference to FIG.

The UE_A8 sets permission information for the ProSe application server_A2 and the Relay UE function (S1702).

The permission information may be set before or after the service authentication procedure.

In setting the permission information of the Relay UE function, the UE_A8 notifies the ProSe application server including the ProSe Relay UE ID assigned by the ProSe function unit.

The ProSe application server_A8 assigns the ProSe Application User ID to the user ID in the application layer based on the reception of the ProSe Relay UE ID.

In addition, the ProSe Application Server_A2 may assign the ProSe Application User ID to the UE_A8 as a Restricted ProSe Application User ID for the restricted discovery.

It should be noted that the restricted discovery means a procedure for detecting a neighboring terminal under the explicit permission from the detected UE.

The ProSe application server_A2 notifies the ProSe Application User ID assigned to the UE_A8.

The UE_A8 acquires the ProSe Application User ID from the ProSe application server_A2.

Next, the UE_A8 transmits a discovery request to the ProSe function unit_A7 (S1704). The discovery request may be a discovery request message that requests UE_A8 to start monitoring and a procedure for transmitting a response message based on the monitoring. Here, the transmission of the discovery request by the UE_A8 may be performed on the condition that the service authentication procedure is completed. More specifically, the ProSe function unit_A7 of Home PLMN, which is the telecommunications carrier with which the contract is made, may be subject to the condition that the UE_A8 is authenticated to monitor. Further, the UE_A8 may acquire the authentication information from the ProSe function unit_A7 upon completion of the authentication and may hold the authentication information.

The discovery request indicates that the ProSe Application User ID, the UE ID, the command indicating the transmission of the monitoring and response message (for example, “monitoring+response”), and the discovery for the UE-to-NW Relay service. The discovery type and the Application ID shown may be included.

Here, the ProSe Application User ID is information notified from the ProSe application server_A2 in the permission setting procedure.

The UE ID is identification information of the UE_A8 and may be, for example, IMSI. Alternatively, it may be ME Identity.

The information indicating the request for sending the monitoring and response message is not limited to the method of identifying with a command, and may be requested by sending the monitoring request message by defining the monitoring request message. More specifically, a message type requesting monitoring may be defined and a request message including the message type may be transmitted.

Further, the discovery type may be information indicating that the requested discovery procedure is for the UE-to-NW Relay service and further the discovery (Model B) using the request message and the response message.

The command and/or discovery type may be capability information indicating that the UE_A 8 has a relay function between a terminal device in the vicinity and a network. Alternatively, separately from these pieces of information, UE_A8 may indicate that the UE_A8 has a relay function between a terminal device in the vicinity and a network.

Note that the UE_A8 may include a combination of a plurality of discovery types and Application IDs in the discovery request and transmit the discovery request.

Specifically, UE_A8 transmits a discovery request including a combination of Application ID A and a discovery type=“UE-to-NW Relay” and a combination of Application ID B and a “recovered discovery”. good.

Also, the ProSe function unit_A7 that is the destination of the discovery request holds in advance information regarding the ProSe function unit_A7 of Home PLMN, which is the telecommunications carrier with which the UE_A8 has a contract, and uses the ProSe function unit_A7 of Home PLMN as the destination. Is also good.

Also, the UE_A8 may include the APN in the discovery request. APN indicates a network to which UE_A8 requests access.

The ProSe function unit_A7 confirms whether the UE_A8 is permitted to send the UE-to-NW Relay monitoring and response message based on the Application ID or the UE ID.

Furthermore, the ProSe function unit_A7 confirms whether or not the Relay Service Code and the timer have already been assigned to the UE_A8.

The ProSe function unit_A7 may send a discovery request to the application server_A2 based on the network policy or the operator policy.

In this case, the ProSe function unit_A7 may send the discovery request including the ProSe Application User ID and the discovery type.

The ProSe application server_A2 confirms the permission information of the user identified by the ProSe Application User ID based on the discovery request received from the ProSe function unit_A7.

The ProSe application server_A2 may send a discovery response as a response to the discovery request to the ProSe function unit_A7 when the permission information is confirmed. The discovery response may include the ProSe Application User ID permitted to use the service. Further, the discovery response may include identification information indicating that the use of the service is permitted.

The ProSe function unit_A7 allocates the Relay Service Code and the timer to the UE_A8 based on the discovery response from the ProSe application server_A2 or the permission of the service by the ProSe function unit_A7.

The Relay Service Code is identification information associated with the UE-to-NW Relay service. Further, the Relay Service Code may be temporary identification information assigned to the service by the ProSe function unit_A7.

The timer is associated with the Relay Service Code, and is a timer indicating the time during which the Relay Service Code is valid. That is, the announcement using the Relay Service Code is permitted until the count of the timer ends.

When the discovery type included in the discovery request is only “UE-to-NW Relay”, the ProSe function unit_A7 is associated with the same Application ID based on the operator policy or the network policy, and the ProSe Restricted Code. (ProSe Restricted Code A) may be further allocated to UE_A8. Furthermore, the ProSe function unit_A7 may correspond to the ProSe Restricted Code, and may allocate a timer indicating the time during which the ProSe Restricted Code is valid.

The ProSe Restricted Code is a code used by the ProSe function unit for the ProSe restricted discovery service, and may be associated with one or a plurality of ProSe Application User IDs.

The ProSe Restricted Discovery service is a procedure detected by a terminal device that is detected from the detected terminal device under explicit permission. For example, the detecting UE confirms the explicit detection permission by acquiring the ProSe Restricted Code from the neighboring detected UE, and receives the announcement including the ProSe Restricted Code to identify the neighboring UE. It is a service to detect.

Note that even if the timer value associated with the ProSe Restricted Code and indicating the time during which the ProSe Restricted Code is valid is different from the timer value associated with the Real Service Code indicating the time during which the Relay Service Code is valid, Good or the same value.

When the discovery request includes a combination of Application ID A and discovery type=“UE-to-NW Relay” and a combination of Application ID B and “restricted discovery”, the ProSe function unit_A7 Further, ProSe Restricted Code (ProSe Restricted Code B) may be assigned to the UE_A8. Furthermore, the ProSe function unit_A7 may correspond to the ProSe Restricted Code, and may allocate a timer indicating the time during which the ProSe Restricted Code is valid.

The ProSe function unit_A7 assigns the ProSe Restricted Code (ProSe Restricted Code B) to the UE_A in response to the discovery request from the UE_A8 and the ProSe Restricted Code (ProSe Restricted Code) assigned to the UE_A regardless of the discovery request from the UE_A8. May be different or different.

Further, the timer associated with ProSe Restricted Code B and the timer associated with ProSe Restricted Code A may be the same or different.

The ProSe function unit_A7 transmits a discovery response to the UE_A8 based on the service permission and the setting of the Relay Service Code (S1710). The discovery response may be a response message to the discovery request received from UE_A8.

The discovery response may include a discovery filter. The discovery filter may include a timer associated with a Relay Service Code and a code.

When the ProSe function unit_A7 assigns the ProSe Restricted Code to the UE_A8, the ProSe function unit_A7 may further include a discovery filter including a timer corresponding to the ProSe Restricted Code and the ProSe Restricted Code in the discovery response and transmit the discovery response.

That is, the ProSe function unit_A7 includes a discovery filter including a timer "T1" associated with the Relay Service Codes "C1" and "C1" in the discovery response, and transmits the discovery response to the UE_A8.

Further, the ProSe function unit_A7 has a ProSe Restricted Code “Cr1” associated with the same Application ID as the Application ID associated with the Real Service Code “C1” and a timer “Tr1” associated with “Cr1”. A discovery filter including and may be included in the discovery response and transmitted.

Further, the ProSe function unit_A7 further includes a ProSe Restricted Code “Cr2” associated with an Application ID different from the Application ID associated with the Real Service Code “C1”, and a timer “Cr2” associated with the ProSe Restricted Code. A discovery filter including "Tr2" may be included in the discovery response and transmitted.

Further, the timers “T1”, “Tr1”, and “Tr2” may have the same value or different values.

Further, any one of “C1”, “Cr1”, and “Cr2” may be the same information, and when they are the same, the timer corresponding to the code may be the same. Specifically, when "Cr1" is "C1", "Tr1" may be "T1", and in this case, the discovery response includes a discovery filter including "T1" and "C1". Good.

Next, UE_A8 receives the discovery response. Further, the value of the ProSe Relay Service Code and the timer may be acquired.

Further, the UE_A8 may acquire a timer corresponding to the ProSe Restricted Code and the ProSe Restricted Code when the discovery response is received or when the discovery filter is received.

In addition, the UE_A8 determines whether the transmission of the monitoring and response message is permitted based on the information included in the discovery response.

When the monitoring and the transmission of the response message are permitted, a radio resource may be allocated (S1712), and a signal including the acquired Relay Service Code may be transmitted to the neighborhood. The wireless resource information such as frequency and time may be acquired from the ProSe function unit_A7, or resources for monitoring and response messages may be held and allocated in advance.

Further, the UE_A8 may start counting the timer based on the reception of the discovery response. Also, the UE_A8 may monitor the request message until the timer expires (Expire). When the timer expires (when the timer expires) such as when the timer value becomes zero, monitoring is stopped. The request message received by monitoring may include a Relay Service Code. Further, the monitored signal may include the UE ID and/or the ProSe Remote UE ID or the ProSe UE ID.

If the discovery response indicates that authentication is not possible, the UE_A8 does not allocate radio resources or make an announcement.

Through the above procedure, the UE_A8 can perform the authentication procedure for monitoring and transmitting the response message.

[2.2.2.2 Discovery Request Procedure of Remote UE]
Next, a procedure in which the UE_B 9 requests detection of a neighboring terminal by transmitting a request message will be described.

When the UE_B 9 has connectivity to the base station, the UE_B 9 may perform the following discovery request procedure and be authenticated by the server device to transmit the request message.

Hereinafter, the discovery procedure for the UE_B 9 to execute the transmission of the request message will be described with reference to FIG. 18.

The UE_B9 sets permission information for the ProSe application server_A2 and the Remote UE function (S1802).

In setting the permission information of the Remote UE function, the UE_B 9 notifies the ProSe application server including the ProSe Remote UE ID or ProSe UE ID assigned by the ProSe function unit.

The ProSe application server_A8 assigns the ProSe Application User ID to the application layer user ID based on the reception of the ProSe Remote UE ID or the ProSe UE ID.

In addition, the ProSe Application Server_A2 may assign the ProSe Application User ID to the UE_B9 as a Restricted ProSe Application User ID for the restricted discovery.

The ProSe application server_A2 notifies the ProSe Application User ID assigned to the UE_B9.

The permission information may be set before or after the service authentication procedure.

Next, UE_B9 transmits a discovery request to ProSe function part_A7 (S1804). The discovery request may be a discovery request message requesting that UE_B9 start the announcement procedure of the request message. Here, the transmission of the discovery request by the UE_B 9 may be performed on the condition that the service authentication procedure is completed. More specifically, the ProSe function unit_A7 of Home PLMN, which is the telecommunications carrier with which the contract is made, may be subject to the condition that the UE_B9 is authenticated to announce. Further, the UE_B9 may acquire the authentication information from the ProSe function unit_A7 upon completion of the authentication and may hold the authentication information.

The discovery request includes a ProSe Application User ID, a UE ID, a command (for example, “request” or “announce”) indicating a request or an announcement request for a request message, and discovery for the UE-to-NW Relay service. A discovery type indicating that there is an application ID and an application ID may be included.

Here, the ProSe Application User ID is information notified from the ProSe application server_A2 in the permission setting procedure.

The UE ID is identification information of the UE_B9 and may be, for example, IMSI. Alternatively, it may be ME Identity.

Further, the information indicating that the request message is requested to be transmitted is not limited to the method of identifying with a command, and may be requested by transmitting the request message by defining the request message of the request procedure. More specifically, a message type requesting the request procedure may be defined and a request message including the message type may be transmitted.

Further, the discovery type may be information indicating that the requested discovery procedure is for the UE-to-NW Relay service and further the discovery (Model B) using the request message and the response message.

The command and/or the discovery type may be capability information indicating that the UE_B 9 has a relay function between a terminal device in the vicinity and a network. Alternatively, separately from these pieces of information, the UE_B 9 may indicate that the UE_B 9 has a relay function between a terminal device and a network in the vicinity.

Note that the UE_B 9 may send a discovery request including a combination of a plurality of discovery types and Application IDs.

Specifically, UE_B9 transmits a discovery request including a combination of Application ID A and discovery type=“UE-to-NW Relay” and a combination of Application ID B and “recovered discovery”. good.

Also, the ProSe function unit_A7 that is the destination of the discovery request holds in advance information regarding the ProSe function unit_A7 of Home PLMN, which is the telecommunications carrier with which the UE_B9 makes a contract, and uses the ProSe function unit_A7 of Home PLMN as the destination. Is also good.

Also, the UE_B 9 may include the APN in the discovery request. APN indicates a network to which UE_A8 requests access.

The ProSe function unit_A7 confirms whether the UE_B9 is permitted to send the UE-to-NW Relay request message and receive the response message based on the Application ID or the UE ID.

Further, the ProSe function unit_A7 confirms whether or not the Relay Service Code and the timer have already been assigned to the UE_B9.

The ProSe function unit_A7 may send a discovery request to the application server_A2 based on the network policy or the operator policy.

In this case, the ProSe function unit_A7 may send the discovery request including the ProSe Application User ID of the UE_B9 and the discovery type.

The ProSe application server_A2 confirms the permission information of the user identified by the ProSe Application User ID based on the discovery request received from the ProSe function unit_A7.

The ProSe application server_A2 may send a discovery response as a response to the discovery request to the ProSe function unit_A7 when the permission information is confirmed. The discovery response may include the ProSe Application User ID permitted to use the service. Further, the discovery response may include identification information indicating that the use of the service is permitted.

The ProSe function unit_A7 allocates the Relay Service Code and the timer to the UE_B9 based on the discovery response from the ProSe application server_A2 or the permission of the service by the ProSe function unit_A7.

The Relay Service Code is identification information associated with the UE-to-NW Relay service. Further, the Relay Service Code may be temporary identification information assigned to the service by the ProSe function unit_A7. Further, the Relay Service Code may be the same as the value assigned to the UE_A8.

The ProSe function unit_A7 may allocate the Relay Service Code from the ProSe Relay UE ID notified from the ProSe application server_A2. Specifically, when the ProSe application server_A2 notifies the ProSe Relay UE ID of the UE_A8, the Relay Service Code assigned to the UE_A8 in the storage unit may be assigned to the UE_B9.

The timer is associated with the Relay Service Code, and is a timer indicating the time during which the Relay Service Code is valid. That is, the announcement using the Relay Service Code is permitted until the count of the timer ends.

Further, the ProSe function unit_A7 may allocate a combination of a plurality of Relay Service Codes and timers to the UE_B9.

In addition, when the discovery type included in the discovery request is only “UE-to-NW Relay”, the ProSe function unit_A7 is associated with the same Application ID based on the operator policy or the network policy, and the ProSe Restricted Code. (ProSe Restricted Code A) may be further allocated to UE_B9. Furthermore, the ProSe function unit_A7 may correspond to the ProSe Restricted Code, and may allocate a timer indicating the time during which the ProSe Restricted Code is valid.

Note that this is different from the value of the timer associated with the ProSe Restricted Code and indicating the time during which the ProSe Restricted Code is valid, and the value of the timer associated with the Real Service Code indicating the time during which the Relay Service Code is valid. May be the same or may be the same value. Also, the timer indicating the time during which the ProSe Restricted Code is valid, which is associated with the ProSe Restricted Code, may be the timer during which the Relay Service Code, which is associated with the Real Service Code, is valid. That is, the timer may be a timer associated with the ProSe Restricted Code and the Real Service Code.

When the discovery request includes a combination of Application ID A and discovery type=“UE-to-NW Relay” and a combination of Application ID B and “restricted discovery”, the ProSe function unit_A7 Further, ProSe Restricted Code (ProSe Restricted Code B) may be assigned to UE_B9. Furthermore, the ProSe function unit_A7 may correspond to the ProSe Restricted Code, and may allocate a timer indicating the time during which the ProSe Restricted Code is valid.

The ProSe function unit_A7 assigns the ProSe Restricted Code (ProSe Restricted Code B) to the UE_B9 in response to the discovery request from the UE_B9, and the ProSe Restricted Code (ProSe Restored Restricted) that is assigned to the UE_B9 regardless of the discovery request from the UE_B9. May be different or different.

Furthermore, the value of the timer associated with ProSe Restricted Code B and the value of the timer associated with ProSe Restricted Code A may be the same or different.

Further, when the ProSe function unit_A7 assigns the same ProSe Restricted Code to the UE_B9, the timer may be the same.

The ProSe function unit_A7 transmits a discovery response to the UE_B9 based on the service permission and the setting of the Relay Service Code (S1810). The discovery response may be a response message to the discovery request received from UE_B9.

The discovery response may include a Relay Service Code and a timer indicating the time during which the Relay Service Code associated with the Relay Service Code is valid.

Furthermore, when the ProSe function unit_A7 assigns the ProSe Restricted Code to the UE_B9, the ProSe function unit_A7 may add a combination of timers corresponding to the ProSe Restricted Code and the ProSe Restricted Code to the discovery response.

That is, the ProSe function unit_A7 transmits the timer "T1" associated with the Relay Service Code "C1" and "C1" to the UE_B9.

Further, the ProSe function unit_A7 has a ProSe Restricted Code “Cr1” associated with the same Application ID as the Application ID associated with the Real Service Code “C1” and a timer “Tr1” associated with “Cr1”. You may send and. Cr1 may be C1 and Tr1 may be T1. In this case, the ProSe function unit_A7 may send "C1" and "T1".

Further, the ProSe function unit_A7 further includes a ProSe Restricted Code "Cr2" associated with an Application ID different from the Application ID associated with the Real Service Code "C1", and a timer "Cr2" associated with "Cr2". "Tr2" may be transmitted.

Further, the timers “T1”, “Tr1”, and “Tr2” may have the same value or different values. If these timers have the same value, the ProSe function unit_A7 may send "T1".

Further, the combination of these codes and the timer may be included in the same discovery response message, or may be included in different discovery responses for each combination.

That is, the ProSe function unit_A7 may transmit the discovery response including a combination of a plurality of ProSe connection services and timers.

Next, UE_B9 receives the discovery response. Further, the value of the ProSe Relay Service Code and the timer may be acquired.

Further, the UE_A8 may acquire the timers corresponding to the ProSe Restricted Code and the ProSe Restricted Code when the discovery response is received.

Further, the UE_A8 determines whether or not the discovery procedure by transmitting the request message is permitted based on the information included in the discovery response.

When the discovery procedure by transmitting the request message is permitted, the wireless resource is allocated (S1812), and the acquired Relay Service Code is used to broadcast the request message to the neighboring terminals. The wireless resource information such as frequency and time may be acquired from the ProSe function unit_A7, or resources to be transmitted may be held and allocated in advance.

Also, the UE_B 9 may start counting the timer based on the reception of the discovery response. Also, the UE_A8 may broadcast the request message at any timing until the timer expires (Expire). When the timer expires (when the timer expires), such as when the timer value becomes zero, the broadcast is stopped. The request message transmitted by the UE_B 9 may include the Relay Service Code. Furthermore, the request message may include the UE ID and/or the ProSe Remote UE ID or the ProSe UE ID.

When the discovery response indicates that the authentication is not possible, the UE_B 9 does not allocate radio resources or make an announcement.

Through the above procedure, the UE_B 9 can perform the authentication procedure for the discovery procedure by transmitting the request message.

When UE_B9 is out of the coverage, the discovery request procedure may be performed by other procedures.

For example, UE_B9 outside the coverage and UE_A8 inside the coverage hold an arbitrary code for discovery in advance, and based on the arbitrary code, UE_A8 sets service authentication and/or permission setting of UE_B9 and/or discovery Authentication of the transmission of the request message based on the request may be performed.

Hereinafter, a specific example will be described. The UE_B9 outside the coverage has the Discovery Service Code for monitoring in advance as described above, and the UE_B9 broadcasts the discovery request including the Discovery Service Code.

In the discovery request, the UE_B9 includes a ProSe Application User ID, a UE ID, a command indicating a request for a discovery procedure by transmitting a request message, a discovery type indicating that the discovery request is for the UE-to-NW Relay service, and the like. , Application ID may be included.

Further, the discovery request may include identification information indicating that the discovery request transfer is requested. Alternatively, the UE_B9 may request the transfer of the discovery request by including the Discovery Service Code.

The UE_A8 that receives the discovery request transmitted by the UE_B9 may transfer the discovery request received from the UE_B9 to the ProSe functional unit_A7 based on the Discovery Service Code included in the discovery request. The UE_A8 may perform service authentication to the ProSe function unit_A7 and permission setting to the ProSe application before transferring the discovery request.

The ProSe function unit_A7 allows the UE_B9 to transmit the UE-to-NW Relay request message and receive the response message based on the discovery request received from the UE_A8 or the acquisition of the Application ID or the UE ID. To see if

Further, the ProSe function unit_A7 confirms whether or not the Relay Service Code and the timer have already been assigned to the UE_B9.

The ProSe function unit_A7 may send a discovery request to the application server_A2 based on the network policy or the operator policy.

Since the discovery request procedure for the application server_A is the same as the above, the description is omitted.

The ProSe function unit_A7 further allocates the Relay Service Code and the timer to the UE_B9 based on the authentication of the monitoring procedure of the UE_B9. Further, as in the case where the UE_B9 is in the coverage, the ProSe function unit_A7 may allocate the ProSe Restricted Code and the timer to the UE_B9.

The method of assigning each code and timer is the same as when UE_B9 is in the coverage, and thus detailed description thereof will be omitted.

The ProSe function unit_A7 transmits the discovery response to the UE_B9 via the UE_A8 based on the authentication of the discovery procedure by transmitting the request message to the UE_B9 and the allocation of the Relay Service Code.

The ProSe function unit_A7 may transmit the discovery response including a Relay Service Code and a timer indicating the time during which the Relay Service Code associated with the Relay Service Code is valid.

As described above, the UE_B 9 may acquire the Relay Service Code and the timer used for transmitting the request message by transmitting the discovery request even outside the coverage.

[2.2.2.3 Procedure for establishing direct communication path and establishing relay connection]
Hereinafter, after the discovery request procedure of 2.2.2.1 and 2.2.2.2 is completed, the Remote UE detects the Relay UE, establishes a direct communication path of ProSe, and further a network using a relay. Describe the procedure to connect to.

The UE_B9, which has been authenticated by the discovery procedure by transmitting the solicitation message, broadcasts the solicitation message in order to detect the neighboring terminals.

The request message may include at least the Relay Service Code acquired from the ProSe function unit_A7 and the ProSe Remote UE ID or the ProSe UE ID.

Further, the request message may include user information regarding the user of UE_B9 and information indicating the QoS requested by the UE. The user information may be, for example, group information to which the user belongs.

The UE_A8 having the authenticated functions of receiving the request message and transmitting the response message receives the request message announced from the UE_B9. In other words, UE_A8 monitors the announcement signal from UE_B9.

The UE_A8 considers to function as a Relay UE of the UE_B9 based on the reception of the request message.

The UE_A 8 may determine whether to allow the UE to function as a Relay UE based on the information about the user included in the request message or the QoS.

If the UE_A8 permits the UE_B9 to function as a Relay UE, the UE_A8 may send a response message to the UE_B9.

The response message may include the Relay Service Code and the ProSe Relay UE ID.

Further, the response message may include information about the user of UE_A8. The information about the user may specifically be the identification information of the group to which the user of UE_A8 belongs.

Further, the response message may include information for identifying the communication capability such as the communication capacity of the PDN connection provided by the UE_A8 to the remote UE.

Alternatively, UE_A8 may respond by including location information in the response message.

UE_B9 detects a nearby Relay UE by receiving the response message from UE_A8.

At this time, UE_B9 may detect a plurality of Relay UEs. In other words, UE_B9 may receive response messages from multiple Relay UEs.

When the UE_B9 detects a plurality of Relay UEs, the UE_B9 selects the Relay UE from the remaining time of the timer associated with the Relay Service Code, the capability of the Relay UE, the communication state of the PDN connection, and the position information of the Relay UE. Is also good.

If UE_B9 selects UE_A8 as the Relay UE, or if it receives an announce signal from UE_A8 only, UE_B9 establishes direct communication with UE_A8.

Specifically, UE_B9 transmits a direct communication establishment request message to UE_A8. The UE_B9 may include the ProSe Relay UE ID of the UE_A8 in the request for establishment of direct communication and transmit the request.

Upon receiving the request message from UE_B9, UE_A8 authenticates UE_B9 and establishes a direct communication connection.

When the direct communication path with the UE_A8 can be established, the UE_B9 requests the UE_A8 to allocate the IP address. When the UE_B9 requests IPv6, the UE_B9 transmits an RS signal (Router Solicitation message) to the UE_A8. Upon receiving the RS signal, the UE_A8 may set the IP address assigned to the UE_B9 from the IPv6 prefix in the UE_B9.

UE_A8 transmits an RA signal (Router Advertisement message) to UE_B9. The RA signal includes the assigned IP address.

Alternatively, when UE_B9 requests IPv4 allocation, UE_B9 sends DHCPv4 discover to UE_A8 to UE_A8. The UE_A8 selects and allocates from the IP addresses pooled in the UE_B9 based on the reception of the detection message. Further, UE_A8 sends a DHCPv4 offer message to UE_B9. UE_A8 includes the IP address assigned to UE_B9 in the DHCPv4 offer.

UE_B9, which has received the DHCP offer from UE_A8, transmits a DHCPSCP request including the received IP address.

The UE_A8, which has received the DHCP request from the UE_B9, returns a DHCP Ack as a response.

As described above, the IPv6 or IPv4 IP address is assigned to the UE_B9, and the UE_B9 is provided with the connection to the PDN connection.

[2.2.3 Relay Service Code Update Procedure]
Next, the procedure for updating the Relay Service Code will be described. The Relay Service Code needs to be updated regularly from the viewpoint of security.

[2.2.3.1 Relay Service Code Update Procedure of Relay UE]
Hereinafter, a procedure for updating the Relay Service Code stored in the UE_A8 that is the Relay UE will be described.

The UE_A8 can update the Relay Service Code based on the notification from the ProSe function unit_A7 and continue monitoring.

In the following description, for the connection service using the UE-to-NW Relay function, the UE_A8 that has acquired the Relay Service Code and the timer and has started counting the timer is newly added to the same connection service. A new ProSe Relay Service Code and timer, invalidate the old Relay Service Code and timer, and use the new ProSe Relay Service Code and timer.

The initial state of this procedure may be a state in which the discovery request procedure described in 2.2.2.1 is completed.

That is, the UE_A8 may be in a state in which “C1” is acquired as the Relay Service Code and “T1” is acquired as the timer from the ProSe function unit_A7 by the discovery request procedure described in 2.2.2.1.

Details will be described below with reference to FIG. First, the UE_A8 starts counting the timer “T1” and validates the Relay Service Code “C1” based on the discovery request procedure or the reception of the discovery response (S1606). After transmitting the discovery response, the ProSe function unit_A7 starts counting the timer "T1'" corresponding to the timer "T1" and validates the Relay Service Code "C1" (S1607).

As described in the discovery request procedure of 2.2.2.1, the UE_A8 may perform the procedure of transmitting the response message based on the monitoring while performing the counting of the timer “T1”.

The UE_A8 may request the ProSe function unit_A7 for the Relay Service Code and the timer for the same relay connection service while the timer “T1” is counting. In other words, the UE_A8 may newly request the Relay Service Code and the timer from the ProSe function unit_A7 before the timer "T1" expires (Expire).

The re-request by the UE_A8 may be executed due to the remaining time of the timer becoming short. More specifically, the UE_A 8 may retain the threshold value in advance and make a request again when the remaining time of the timer becomes equal to the threshold value or when the remaining time is less than the threshold value. The re-request trigger is not limited to these, and may be performed under other conditions, or may be performed at any timing.

The UE_A8 may send a discovery request to the ProSe function unit_A7 in order to request the Relay Service Code and the timer for the same relay connection service again (S1608).

Here, the discovery request may be a discovery request message for a discovery procedure by sending a monitoring and response message. The discovery request message may be the discovery request message (S1704) transmitted by the UE_A8 described in the 2.2.2.1 discovery request procedure. The process regarding the transmission of the UE_A8, the configuration of the discovery request message, the information elements included in the discovery request message, and the like may be the same, and thus detailed description thereof will be omitted here.

Note that the UE_A8 may indicate the request message for the same service by including the same APN as the APN included in the previous discovery request in the discovery request.

Next, the ProSe function unit_A7 receives the discovery request. Furthermore, a discovery response is transmitted to UE_A8 as a response message (S1610). The response message may be transmitted by including the Relay Service Code and a timer.

Further, this discovery response may be the discovery response message described in 2.2.2.1 (S1710).

That is, the ProSe function unit_A7 may include the discovery filter in the discovery response and transmit the discovery response. The discovery filter may include a Relay Service Code and a timer.

Here, the condition for transmitting the discovery response may be transmitted based on the reception of the discovery request or may be transmitted based on the authentication. Here, a specific method of authentication may be performed by the method described in the discovery request procedure in 2.2.2.

Alternatively, the ProSe function unit_A7 may update the ProSe Relay Service Code based on the connection state of the network or the operator policy without receiving the discovery request from the UE_A8 again. The Relay Service Code updated by the ProSe function unit_A7 may be included in the notification message and notified to the UE_A8.

Similar to the discovery response, the notification message may include a discovery filter associated with the updated Relay Service Code and including a timer value indicating a time during which the Relay Service Code is valid.

In addition, the Relay Service Code and the timer included in the discovery filter of the discovery response or the notification message are the old Relay Service Code "C1" that has already been assigned and the remaining timer "T1" corresponding to the old Relay Service Code "C1". You may include time.

Alternatively, a Relay Service Code and a timer included in the discovery filter of the discovery response or the notification message are timers corresponding to a new Relay Service Code “C2” different from the Relay Service Code “C1” and a new Relay Service Code “C2”. "T2" may be included.

Here, the old Relay Service Code "C1" and the new Relay Service Code "C2" may be associated with a single Application ID.

Whether to transmit the old Relay Service Code or the new Relay Service Code may be determined based on the following conditions and processing.

Since the remaining time of the timer T1 is short, the ProSe function unit_A7 may include a new Relay Service Code “C2” and a new timer “T2” for transmission. More specifically, the ProSe function unit_A7 holds a threshold value in advance, and when the remaining time of the timer becomes equal to the threshold value or when the remaining time is less than the threshold value, a new Relay Service Code "C2" and a timer You may transmit including "T2."

Further, the ProSe function unit_A7 may transmit the old Relay Service Code "C1" and the remaining time of the timer "T1" when the remaining time of the timer "T1" is sufficient. More specifically, the ProSe function unit_A7 holds a threshold value in advance, and when the remaining time of the timer is greater than or equal to the threshold value, a new Relay Service Code "C1" and a timer "T1" are set. The time may be transmitted including the remaining time.

Alternatively, the ProSe function unit_A7 may determine based on the received discovery request. For example, the UE_A 8 may transmit the discovery request including the identification information.

This identification information may be identification information indicating whether the old Relay Service Code is requested or a new Relay Service Code is requested.

The ProSe function unit_A7 may include a new Relay Service Code "C2" and a timer "T2" based on the identification information and transmit the new Relay Service Code "C2". Further, based on the identification information, the old Relay Service Code “C1” and the remaining time of the timer “T1” may be included in the transmission.

Also, the ProSe function unit_A7 may be determined based on the presence or absence of the identification information. That is, the identification information may be identification information indicating a request for a new Relay Service Code. For example, the UE_A8 may send the discovery request without including the identification information and request the old Relay Service Code. Further, the UE_A8 may send a discovery request including the identification information and request a new Relay Service Code.

In addition, based on the fact that the identification information is not included in the discovery request, the old Relay Service Code “C1” and the remaining time of the timer “T1” may be included in the transmission. In addition, the ProSe function unit_A7 may include a new Relay Service Code "C2" and a timer "T2" for transmission based on the identification information included in the discovery request.

Alternatively, the identification information may be identification information indicating a request for an old Relay Service Code. For example, the UE_A8 may send a discovery request without including the identification information and request a new Relay Service Code. Moreover, UE_A8 may transmit a discovery request including identification information and may request the old Relay Service Code.

The ProSe function unit_A7 may include a new Relay Service Code "C2" and a timer "T2" for transmission based on the fact that the identification information is not included in the discovery request. In addition, based on the fact that the discovery request includes the identification information, the old Relay Service Code “C1” and the remaining time of the timer “T1” may be included in the transmission.

Such identification information may be an information element such as a flag included in the discovery request, or an information element indicating the message type of the control message.

In this way, the ProSe function unit_A7 may transmit the time including the remaining time of the timer "T1" to synchronize the timers of a plurality of UEs.

The discovery request may be the discovery request described in 2.2.2.1. Therefore, these pieces of identification information may be included in the discovery request described in 2.2.2.1.

In addition, whether to transmit the old Relay Service Code or the new Relay Service Code may be determined based on the setting of the ProSe function unit_A7 and the like. For example, the setting of the ProSe function unit_A7 may be determined and set according to the policy (Mobile Operator Policy) of the carrier operating the ProSe function unit_A7 or the policy of the application carrier.

It should be noted that the determination may be made by combining the conditions and processing described above, or may be made based on another method.

Next, UE_A8 receives the discovery response. Furthermore, the UE_A8 acquires the Relay Service Code and the timer included in the discovery response.

The UE_A8 may acquire the Relay Service Code and the timer by acquiring the discovery response including the discovery filter.

The UE_A8 stops using the old “C1” and starts using the new Relay Service Code “C2” when acquiring the new Relay Service Code “C2” or when receiving the new discovery filter. (S1612).

Specifically, for example, the UE_A8 may invalidate the old Relay Service Code “C1” and validate the new Relay Service Code “C2”.

The UE_A8 may stop counting the timer "T1" corresponding to the old Relay Service Code "C1" and start counting the timer "T2" corresponding to the new Relay Service Code "C2".

Further, the old Relay Service Code “C1” and the timer “T1” may be deleted from the storage unit.

Further, the UE_A8 may stop the monitoring using the old Relay Service Code "C1", and thereafter may perform the setting such that the monitoring using the Relay Service Code "C1" is not performed thereafter.

In addition, the ProSe function unit_A7 may stop counting “T1′” and start counting “T2′” corresponding to the timer “T2” along with the transmission of the discovery response (S1614).

The UE_A8 may transmit an announcement signal using the new Relay Service Code “C2” until the timer “T2” corresponding to the new Relay Service Code “C2” expires (Expire).

Further, whether or not the UE_A8 executes the update procedure of the Relay Service Code may be determined based on the setting of the UE_A8 and the like. For example, the setting of the UE_A8 may be determined and set by a user policy, a policy (Mobile Operator Policy) of a communication carrier who operates the ProSe function unit_A7, or a policy of an application carrier.

It should be noted that the determination may be made by combining the conditions and processing described above, or may be made based on another method.

In addition, when the UE_A8 does not perform the update procedure of the Relay Service Code, the UE_A8 may continue monitoring using the old Relay Service Code. For example, when the UE_A8 receives the old Relay Service Code “C1” by receiving the response message, the UE_A8 uses the old Relay Service Code “C1” until the counting timer “T1” expires (Expire). You may continue the monitoring that you had done. Note that the UE_A8 may update the value of the timer received from the remaining time of the timer “T1” and continue counting.

Alternatively, when the UE_A8 does not perform the update procedure of the Relay Service Code, the UE_A8 may stop the monitoring using the old Relay Service Code and the new Relay Service Code.

Through the above procedure, the UE_A8 can continue the monitoring corresponding to the connection service by the relay.

If the UE_A8 is assigned an old Relay Service Code “C1” and a timer “T1” and ProSe Restricted Code “Cr1” and a timer “Tr1” are assigned to the same Application ID, the update of the Real Service Code is performed. The ProSe Restricted Code and the timer may be updated during the procedure.

Alternatively, only the Relay Service Code and the timer may be updated.

[2.2.3.2 Remote UE Relay Service Code Update Procedure]
Next, the procedure for updating the Relay Service Code of the Remote UE will be described. As shown in FIG. 1, when the Remote UE has already acquired the Relay Service Code, the Remote UE may be out of the coverage.

With the update of the Relay Service Code of the Relay UE, it is necessary to update the Real Service Code of the Remote UE as well.

Specifically, for example, when the UE_A8 is providing the PDN connection service using the relay by the direct communication of ProSe to the neighboring terminal, the UE_A8 updates the Relay Service Code and the timer by using the direct communication of the ProSe. Based on this, the neighboring terminal may be notified of the update of the Relay Service Code.

Specifically, when the UE_A8 is providing the PDN connection by the relay to the UE_B9 and acquires a new Real Service Code and a timer, the UE_A8 updates the Relay Service Code and the timer, and notifies the UE_B9 of the update of the Relay Service Code. The notification message may be notified using ProSe direct communication.

The UE_A8 may include, in the notification message, identification information for identifying the notification message of the update of the Relay Service Code.

Alternatively, the UE_A8 may implicitly stop providing the PDN connection to the UE_B9 upon receiving the new Relay Service Code.

UE_B9 receives the notification message from UE_A8. The UE_B9 transmits a discovery request message for updating the Real Service Code and/or the timer upon receiving the notification message from the UE_A8 or upon implicitly stopping the PDN connection service.

The discovery request message transmitted from the UE_B9 is the same as the discovery request message described in 2.2.2.2, so detailed description will be omitted.

Similar to the explanation in 2.2.2.2, when the UE_B9 is out of the coverage, the UE_A8 which is the Relay UE may transfer the discovery request to the ProSe function unit_A7.

The ProSe function unit_A7 may allocate a new Relay Service Code and a timer to the UE_B9 based on the reception of the discovery request.

Further, the ProSe function unit_A7 may send the discovery response to the UE_B9 via the UE_A8.

The discovery response message may include a new Relay Service Code and a new timer.

The UE_B9 may stop the timer corresponding to the old Relay Service Code and update the Relay Service Code and the timer with the acquisition of the new Relay Service Code and the new timer.

The UE_B9 may stop transmitting the request message as the timer stops.

The UE_B9 may send a request message upon receipt of a new Relay Service Code and timer.

As described above, the procedure for updating the Real Service Code of the Remote UE may be executed. In other words, the Remote UE may re-request a new Real Service Code to the ProSe functional unit in response to the notification from the Relay UE and the suspension of service provision, thereby acquiring and updating the new Relay Service Code and timer.

[2.2.4 Modification of Relay Service Code Update Procedure]
In 2.2.3, the example of the procedure in which the UE_A8 updates the Relay Service Code has been described, but the specific procedure is not limited to this embodiment, and the design and the range not departing from the gist of the present invention Combinations and the like are also included in the present invention.

The procedure for acquiring and updating the Relay Service Code for the Remote UE to detect the Relay UE by using the Model B detection has been described above.

Further, a procedure has been described in which the Remote UE establishes a direct connection with the Relay UE based on the detection and establishes a PDN connection.

[3. Modification]
Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and a design etc. within the scope not departing from the gist of the present invention are also included in the present invention. Be done.

Further, the program that operates in each device in each embodiment is a program that controls a CPU or the like (a program that causes a computer to function) so as to realize the functions of the above-described embodiments. Then, the information handled by these devices is temporarily stored in a temporary storage device (for example, RAM) at the time of the processing, then stored in various ROM or HDD storage devices, and read and corrected by the CPU as necessary. -Writing is performed.

Here, as a recording medium for storing the program, a semiconductor medium (for example, a ROM or a non-volatile memory card), an optical recording medium/a magneto-optical recording medium (for example, a DVD (Digital Versatile Disc), an MO (Magneto Optical) Disc), MD (Mini Disc), CD (Compact Disc), BD, etc.), magnetic recording medium (for example, magnetic tape, flexible disk, etc.), and the like. Further, by executing the loaded program, not only the functions of the above-described embodiment are realized, but also by processing in cooperation with the operating system or another application program based on the instructions of the program, The function of the invention may be realized in some cases.

Further, in the case of distribution in the market, the program can be stored in a portable recording medium for distribution, or can be transferred to a server computer connected via a network such as the Internet. In this case, it goes without saying that the storage device of the server computer is also included in the present invention.

Further, part or all of each device in the above-described embodiments may be typically realized as an LSI (Large Scale Integration) which is an integrated circuit. Each functional block of each device may be individually made into a chip, or a part or all of them may be integrated into a chip. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. Further, in the case where a technology for forming an integrated circuit that replaces the LSI appears due to the progress of semiconductor technology, it goes without saying that an integrated circuit according to the technology can be used.

Further, in the above-described embodiment, LTE and WLAN (for example, IEEE 802.11a/b/n etc.) have been described as examples of the wireless access network, but WiMAX may be used instead of WLAN.

1 Communication System 2 Core Network 3 IP Mobile Communication Network_A
5 PDN_A
7 ProSe function part_A
8 UE_A
9 UE_B
50 HSS_A
60 PCRF_A
55 AAA_A
30 PGW_A
65 ePDG_A
35 SGW_A
40 MME_A
80 LTE AN_A
75 WLAN ANb
70 WLAN ANa
45 eNB_A
76 WLAN APb
72 WLAN APa

Claims (10)

A communication control method for a UE (User Equipment), comprising:
In the service certification procedure,
ProSe (Proximity-based Services) functional unit in PLMN requires Direct Discovery and/or Direct Communication authentication ,
As a response to the request, an authentication message including a first timer value indicating the time when the authentication is valid is received from the ProSe function unit ,
Starting a first timer based on receiving the first timer value;
In the announcement request procedure, a discovery response message including a ProSe Restricted Code and a second timer value corresponding to the ProSe Restricted Code is received from the ProSe functional unit ,
Starting a second timer based on receiving the discovery response message;
Send an announcement message including the ProSe Restricted Code to the neighboring UE,
The ProSe Restricted Code is used for Direct Discovery,
A communication control method for a UE, comprising: The UE requests the ProSe functional unit for the authentication when the first timer expires,
The communication control method for a UE according to claim 1, characterized in that. The UE receives a Relay Service Code from the ProSe function unit ,
The Relay Service Code is a code used to identify the connectivity service provided by the UE,
The communication control method of UE according to claim 1 or 2, characterized in that. A communication control method for a ProSe (Proximity-based Services) functional unit in PLMN,
In the service certification procedure,
Receives a Direct Discovery and/or Direct Communication authentication request from the UE (User Equipment),
As a response to the request, to the UE, send an authentication message including a first timer value indicating the time the authentication is valid,
In the announcement request procedure, a discovery response message including a ProSe Restricted Code and a second timer value corresponding to the ProSe Restricted Code is transmitted to the UE,
The first timer value is used by the UE to start a first timer,
The discovery response message is used by the UE to start a second timer,
The ProSe Restricted Code is a code included in an announcement message transmitted by the UE to a neighboring UE,
The ProSe Restricted Code is used for Direct Discovery,
A communication control method for a ProSe functional unit , which is characterized in that The ProSe function unit transmits a Relay Service Code to the UE,
The Relay Service Code is a code used to identify the connectivity service provided by the UE,
The communication control method of the ProSe functional unit according to claim 4, wherein. A UE (User Equipment) including a transmission/reception unit and a control unit,
In the service authentication procedure, the transmitting/receiving unit
ProSe (Proximity-based Services) function in PLMN requires Direct Discovery and/or Direct Communication authentication ,
As a response to the request, an authentication message including a first timer value indicating the time when the authentication is valid is received from the ProSe function unit ,
The control unit starts a first timer based on the reception of the first timer value;
The transmission/reception unit further receives a discovery response message including a ProSe Restricted Code and a second timer value corresponding to the ProSe Restricted Code from the ProSe function unit in an announcement request procedure,
The control unit further starts a second timer based on the reception of the discovery response message,
The transmission/reception unit further transmits an announcement message including the ProSe Restricted Code to the neighboring UE,
The ProSe Restricted Code is used for Direct Discovery,
UE characterized by that. The transceiver further requests the ProSe functional unit for the authentication when the first timer expires,
The UE according to claim 6, characterized in that The transmission/reception unit further receives a Relay Service Code from the ProSe function unit ,
The Relay Service Code is a code used to identify the connectivity service provided by the UE,
The UE according to claim 6 or 7, characterized in that. ProSe (Proximity-based Services) functional unit in PLMN,
The ProSe functional unit includes a transmitting/receiving unit,
In the service authentication procedure, the transmitting/receiving unit
Receives a Direct Discovery and/or Direct Communication authentication request from the UE (User Equipment),
As a response to the request, to the UE, send an authentication message including a first timer value indicating the time the authentication is valid,
The transceiver further transmits a discovery response message including a ProSe Restricted Code and a second timer value corresponding to the ProSe Restricted Code to the UE in the announcement request procedure,
The first timer value is used by the UE to start a first timer,
The discovery response message is used by the UE to start a second timer,
The ProSe Restricted Code is a code included in an announcement message transmitted by the UE to a neighboring UE,
The ProSe Restricted Code is used for Direct Discovery,
A ProSe functional unit that is characterized by that. The transmission/reception unit further transmits a Relay Service Code to the UE,
The Relay Service Code is a code used to identify the connectivity service provided by the UE,
The ProSe functional unit according to claim 9, wherein

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